What do QA and QC mean?

Quality control QC.QA.IPQC . FQC.PQC.IQC Definition of. QE.. OQC
There are many more, please try to be more detailed, I will add points

PQA:Product Quality Assurance, product quality assurance SQA:Supplier Quality Assurance, supplier quality assurance IQC:Incoming Quality Control, incoming inspection DQA:Design Quality Assurance, design quality assurance TQA:Total Quality Assurance, comprehensive quality

What is QE QA QS QMS QC

QE = Quality Engineering
QA = quality assurance
QC = quality inspection
QMS = quality inspection system

QA = negative 1 times 10 to the power of negative 8, QB = 4 times 10 to the power of negative 8,
If the Coulomb force between two charges is known to be 10 to the negative 5th power, then the solution is obtained;
1. If the charge at B is removed, what is the electric field intensity at B?
2. If the charge at B is not removed, what is the electric field intensity at the midpoint of AB line?
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E = f / QB = 0.00001n / 0.00000004c = 250N / C2. If the test charge q is 1cf1 = 4qaq / R & # 178; F2 = 4qbq / R & # 178; R & # 178; = qabb / F = 0.000000000000004c & # 178; = 0.00001n = 0.0000000004mf '= F2 + F1 = 4q (QA + QB) / R & # 178; = 5000ne = f' / Q = 5000n / C or simpler

The distance between two point charges a and B is 10cm. We know that QA = QB = q, and there is another charge C whose charge quantity is QC = 2q. Ask where C is placed on the line between a and B to keep B flat

In order to keep the balance of B, it is necessary to make the force balance. Take B as the research object, f (AB) = f (BC), from F = K (Q1 * Q2) / R ^ 2, QA = QB = q, QC = 2q, r = 10cm, let the distance between B and C be x, then: KQ ^ 2 / R ^ 2 = K2 * q ^ 2 / x ^ 2, x = radical 2 * r = 14.14 cm.ps The principle of three-point equilibrium in Physics: three points are collinear

There are three point charges fixed on a straight line in vacuum, QA = 8 × 10-5c, QB = 5 × 10-5c, QC = 4 × 10-5c, ab = 8cm, BC = 4cm
A B C
___________________ Find the magnitude and direction of Coulomb force on QB
K=9.010^9Nm^2/c^2

If f is equal to kqq / R ^ 2, we can find the Coulomb force of a to B. similarly, we can find the Coulomb force of C to B. because both of them are positive charges, they repel each other. B is affected by two Coulomb forces, and the greater one is the direction of Coulomb force of B

As shown in the figure, different point charges QA, QB, QA = - 1 × 10-8c, QB = 4 × 10-8c are placed at two points a and B in vacuum respectively. It is known that the Coulomb gravitational force between two points of charges is 10-5n, so we can find: (1) if the charge at B is removed, what is the electric field intensity at B? (2) If the point charge at B is not removed, what is the field strength of C at the midpoint of AB line?

(1) According to the definition formula of electric field intensity, the electric field intensity at B is 250N / C after the charge at B is removed. (2) the distance between a and B: r = kqaqbf = (9 × 109 × 1 × 10 − 8 × 4 × 10 − 810 − 5) 12  0.6ma

What is the difference between QA and QC

QC: quality control, quality control, product quality inspection, analysis and improvement after quality problems are found, as well as unqualified product control. Generally, it includes IQC (incoming quality control), IPQC (in-process quality control), FQC (final quality control), oqc (out going quality control), IQC (in-process quality control), IQC (in-process quality control), IQC (in-process quality control), IQC (in-process quality control), IQC (in-process quality control), oqc (out going quality control), IQC (in-process quality control), IQC (in-process quality control), IQC (in-process quality control), IQ, Some companies call the whole quality control department no matter 3721 QC.QC It focuses on the product rather than the system (system). This is the main difference between QA and QA. The purpose is consistent with QA, which is to "meet or exceed customer requirements.", Through the establishment and maintenance of quality management system to ensure that there are no problems in product quality. Generally, it includes system engineer, SQE (Supplier Quality Engineer), CTS (customer technical service personnel), 6Sigma engineer, calibration and management personnel of measuring instruments, etc, For example, QC is a policeman and QA is a judge. QC just needs to catch those who violate the law. It can't prevent others from committing crimes and convicting them. The judge is to make laws to prevent crimes and pronounce the results according to the law; &#To sum up, QC is mainly the quality inspection activities after the event, and the default error is allowed. It is expected to find and select errors. QA is mainly the quality assurance activities in advance, focusing on prevention. It is expected to reduce the probability of errors, For example, QC will eliminate the defective products after inspection, and then feed back the defective information to the relevant departments to take improvement measures. Therefore, the control scope of QC is mainly in the factory. Its purpose is to prevent unqualified products from entering, transferring and leaving the factory, and ensure that the products meet the quality requirements and only qualified products can be delivered to customers, Even if the customer is sure that the product you provide can meet his requirements, it is necessary to review the customer's requirements from the beginning of market research, product development, order receiving and material purchasing, incoming inspection, production process control and delivery, after-sales service and other stages to leave evidence to prove that every step of the factory's activities are carried out according to the customer's requirements, and the purpose of QA is not to ensure the product quality, Ensuring product quality is the task of QC. QA is mainly to provide assurance. Therefore, it is necessary to manage the whole process from understanding customers' requirements to after-sales service. This requires enterprises to establish a quality control system, formulate corresponding documents, standardize the activities of each process, and leave evidence for the implementation of activities, so as to provide trust. This kind of trust can be divided into internal and external, even if customers are relieved, It is believed that the factory produces and delivers products according to its requirements. Internally, it is to reassure the boss of the factory, because the boss is the first person responsible for product quality, and he should take full responsibility for product quality accidents. This is also the main requirement for countries to formulate product quality laws, so as to urge enterprises to really attach importance to quality. Therefore, in order to avoid taking responsibility for quality, the boss should, However, it is impossible for the boss to understand whether the internal staff of the factory operate according to the requirements of the documents one by one, which requires QA to audit on behalf of him to find out whether the requirements of the documents are complied with, so as to make the boss believe that the activities of the factory are carried out according to the requirements of the documents and make him feel at ease; Therefore, the main difference between QC and QA is that the former is to ensure that the product quality meets the requirements, while the latter is to establish a system and ensure that the system operates according to the requirements, so as to provide internal and external trust. At the same time, QC and QA have the same point: both QC and QA need to carry out verification. For example, QC testing the product according to the standards is to verify whether the product meets the requirements, and QA conducting internal audit is to verify whether the system operates in accordance with the standards, Another example is QA's delivery audit and reliability test, which is to verify whether the products have been carried out according to the regulations and whether they can meet the requirements, so as to ensure that the products delivered by the factory are qualified and comply with the relevant regulations

About QA, QC
What is QA? What are the categories of QC?

QA is the abbreviation of quality assurance in English, which means quality assurance in Chinese
QC is the abbreviation of quality control in English, which means quality control in Chinese
difference:
The most important responsibility of QA is to improve the system level, focusing on the prevention of problems and the root cause exploration of existing problems and the implementation of permment C / A, so as to reduce the occurrence of defects
With the emergence of QA, the scope of quality management of enterprises is further promoted, including the whole scope of quality assurance, and the authority of quality management personnel is further increased. Some enterprises' QA also includes CS (customer satisfaction) business, which is to deal with customer complaints: analysis, countermeasures, customer satisfaction survey, etc
QC refers to inspection. In the development history of quality management, "QC" first appeared. It is the most basic requirement of quality management that products are inspected and then shipped. QC's work is mainly the inspection of finished products, raw and auxiliary materials. QA is a quality assurance for the whole company, including the release of finished products, raw and auxiliary materials, and the normal operation of quality management system
The most important responsibility of QC is to monitor the finished products (mainly raw material, in-process goods, finish goods, in-process audit), focusing on detecting defect through sample inspection
At present, QA and QC are the fastest growing software testing industry

In the pyramid p-abcd with square bottom, the plane PCD is perpendicular to the plane ABCD, (1) prove that PD is perpendicular to BC, (2) find the size of dihedral angle b-pd-c

In plane PCD, make PE ⊥ CD in E, make ef / / BC intersect AB in F, then CD ⊥ efcd ⊥ plane PEF, because plane PCD is perpendicular to plane ABCD, then PE ⊥ plane ABCD, PE ⊥ BC, BC ⊥ CD, BC ⊥ PE, then BC ⊥ plane PCD, namely BC ⊥ PD2)

What do QA and QC mean?