Let a be a third-order matrix, A1, A2, A3 are all three-dimensional vectors, satisfying that | A1, A2, A3 | is not equal to 0, Ask for a

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• 1. In the coordinate operation of space vector, what condition can satisfy the intersection of two vectors?
• 2. As shown in the figure, in the triangle ABC, ab = AC, angle BAC = 90 degrees, D is the midpoint of BC, De is perpendicular to DF, if be = 12, CF = 5, calculate EF
• 3. 1. Any rational number has opposite numbers. 2. On the number axis, the numbers represented by the points on both sides of the origin are opposite to each other. 3. Which statement is true that positive numbers and negative numbers are reciprocal to each other
• 4. How to connect star delta step down starting control circuit of three phase asynchronous motor
• 5. In a series circuit, the higher the resistance, the higher the partial voltage and the higher the power The saying is: right, wrong
• 6. Rated voltage: 220 V; rated power: 1200 W; frequency: 50 Hz; seek the voltage. Describe the possible reasons why the actual voltage is lower than 220 v. do not consider the influence of temperature on the resistance
• 7. If the rated power of a bulb is 10W and the resistance is 10 Ω, the rated voltage of the bulb is______ In order to connect the lamp to a 12V power supply and make the lamp work normally, one needs to be connected in series______ Ohm resistance
• 8. Resistor R1 and R2 are connected in series in the circuit. If the voltages at both ends of R1 and R2 are U1 and U2 respectively, U1 is better than U2 = --
• 9. In the experiment of exploring the relationship between current, voltage and resistance, we should study the relationship between current, voltage and resistance
• 10. The ammeter is equivalent to a resistance point in series with the meter head, and the voltmeter is equivalent to a resistance in parallel. What are the functions of the two resistors
• 11. In the two sequences {an} {BN}, an ＞ 0, BN ＞ 0, and an, BN ^ 2, an + 1 are equal difference sequences, and BN ^ 2, an + 1, BN + 1 ^ 2 are equal ratio sequences A1 = 1, B1 = root 2 find Sn = 1 / A1 + 1 / A2 +... + 1 / an
• 12. Given SiNx = 13, sin (x + y) = 1, then sin (2Y + x) = 1___ ．
• 13. Multiple choice questions Restrictive competition agreements can be divided into () Options: a. Split market agreement b. Horizontal restricted competition agreement c. Fixed price agreement d. Vertical competition restriction agreement
• 14. Solution equation: 2 / 5x + 1 / 5x = 6
• 15. A few folds in 3600 seconds is one
• 16. How many minutes is an angle of one degree
• 17. How many millimeters is one degree
• 18. How many W, how many hours is a kilowatt hour?
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