Why measure the surface temperature of the compressor when the air conditioner is tested in the laboratory? The reason, method and principle of measurement;

The enthalpy difference laboratory measures the "surface temperature" of the air-conditioning compressor in several places; measuring point 1: the temperature at the bottom of the compressor, which is on the side of the lower part of the compressor and directly opposite the air return pipe. The purpose of measuring this point is to get the temperature of the lubricating oil in the compressor, so as to judge the amount of liquid refrigerant in the compressor oil, which is convenient and suitable

The manual team plans to make up some Chinese knots for friends. It plans to make 56 knots per hour and make them up for 10 hours. In fact, there are 24 more knots per hour than planned. How many hours can we finish it?

7 hours

Physical problems -- in the experiment of exploring the relationship between temperature and time when water cools down
In the experiment of exploring "the relationship between temperature and time when water cools down", Xiao Ming recorded the experimental data in the table below. According to the information in the table, we can draw the conclusion that "the temperature decreases more and more slowly with the increase of time when water cools down", and the information extracted from the table is ()
A. Temperature is inversely proportional to time
B. Time changes, so does temperature
C. The time increases and the temperature decreases
D. The increase of time is equal to the decrease of temperature
Dalian 2012 high school entrance examination. The picture is very easy to search
What's wrong with BC's two options? Except for inaccuracy

The key word is "information extracted from the table that can lead to the conclusion", because according to ABC, we can't get:
The conclusion is that the temperature decreases more and more slowly with the increase of time
Therefore, examination is the key, according to ABC is unable to draw the conclusion of the description, because they are wrong. As a single choice, there is a requirement that "choose the best". This should be noted
After becoming multiple choice, it is said above, pay attention to keywords

Add "+" or "-" before the numbers 3, 4, 5, 6, 7, 8 and 9 to make their sum - 10. Please come up with two solutions

① The sum of + 3, + 4, - 5, - 6, - 7, - 8, + 9. ② + 3, - 4, + 5, - 6, - 7, + 8, - 9

Add "+" or "-" before the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 to make their sum - 10
Please come up with as many plans as you can

The following answers are for reference: 1, + 2 + 3-4 + 5-6 + 7-8 + 9 2, - 2-3-4-5-7 + 8 + 9 3, + 2-3 + 4 + 5 + 6-7-8-9 4, - 2 + 3-4 + 5-6 + 9 5, - 2-3-4-5-7 + 8-9 6, + 2-3 + 5 + 6-7 + 8-9 4, + 2-3 + 4 + 6-7-8-9 4, - 2 + 3-4 + 5-6-7-8 + 9 5, - 2-3 + 4-5 + 6 + 7 + 8-9

Fill 2.1, 2.5, 2.9, 18.4, 18.8, 19.2, 34.7, 35.1, 35.5 in the square so that the sum of three numbers in each row, column and diagonal is equal

2.5 35.5 18.4
34.7 18.8 2.9
19.2 2.1 35.1

Fill in 2.1, 2.52.9, 18.4.18.8.19.2.34.735.135.5 in the box, so that each row, each column, and each diagonal line is
Fill 2.1, 2.5, 2.9, 18.4, 18.8, 19.2, 34.7, 35.1, 35.5 in the square so that the sum of three numbers in each row, column and diagonal is equal
It's 3x3

2.5, 35.5 ,18.4
34.7 ,18.8, 2.9
19.2 ,2.1 ,35.1

2.1, 2.5, 2.9, 18.4, 18.8, 19.2, 34.7, 35.1, 35.5 fill in the nine palace grid, so that the sum of three numbers on each diagonal line in each row and column is equal
Thank you, big brother and big sister

2.5 35.5 18.4
34.7 18.8 2.9
19.2 2.1 35.1

Fill in 2.1, 2.5, 2.9, 18.4, 18.8, 19.2, 34.7, 35.1 and 35.5 in the Jiugong grid, so that the sum of the three diagonal numbers in each row and column is equal

35.1 2.1 19.2
209 18.8 34.7
18.4 35.5 2.5

1 / 24 / [(7 / 9-1 / 2) * 3 / 5]

1 / 24 / [(7 / 9-1 / 2) * 3 / 5]
=(1/24)/[(14/18-9/18)(3/5)]
=(1/24)/[(5/18)(3/5)]
=(1/24)/(3/18)
=(1/24)/(1/6)
=(1/24)×6=1/4.

Why measure the surface temperature of the compressor when the air conditioner is tested in the laboratory? The reason, method and principle of measurement;