By establishing the space rectangular coordinate system and proving that the normal vectors of two planes are perpendicular, we can deduce: are these two planes perpendicular to each other?

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• 1. As shown in the figure, in RT △ ABC, ∠ ACB = 90 ° and AC = B, BC = a, ab = C, the bisector of ∠ A and ∠ B intersects at O, the distance from O to AB is OD, what is the quantitative relationship between od and a, B, C I know the answer is od = (a + B-C) / 2,
• 2. On the number axis, the distance from point a to the origin o is equal to 2, and on the left side of the origin, the distance from point B to the origin is equal to 7. Find the distance between two points a and B. if the position of point a remains unchanged and the distance between two points a and B is equal to 9, what is the number represented by point B?
• 3. What is the power factor of 380V and 180A?
• 4. When an electric furnace works, it converts electric energy into heat energy, When an electric furnace works, it turns electric energy into heat energy; when an electric furnace works, it turns electric energy into heat; when an electric furnace works, it turns electric energy into internal energy! Which statement is correct? What's the difference between the three?
• 5. How many watts is the power supply of 220 V, 3a, 50 Hz? My power supply is the power supply of the computer, which is standard for Jinhe Tian chassis
• 6. A bulb marked with "24 V 40 W" is connected to a 36 V power supply. In order to make it shine normally, what resistance should be connected in series? The power consumed by this resistance
• 7. What is the function of rectifier diode parallel capacitor resistor after switching power supply transformer The DC power supply is connected in parallel with a capacitor and a resistor through the rectifier diode of the switch transformer. What are the functions of the capacitor and the resistor
• 8. The ratio of electric power to current voltage resistance in parallel circuit P1:P2=_____ ( I ) ______ ( U ) ————（ R ） Just give me the alphabet. No text
• 9. In a circuit, the maximum range of the ammeter is a ampere, and the voltage is B volt. There is a variable resistor Rx. Q: how to expand the range of the ammeter ten times
• 10. A resistance marked "1K ohm, 10W", the maximum current allowed to pass is_____ The maximum voltage allowed to be applied to both ends of the resistor is. When the voltage at both ends of the resistor is 40V, the actual power consumed is. (it is assumed that the resistance does not change with temperature)
• 11. What is the formula for calculating the standard deviation?
• 12. Given that {an} is an arithmetic sequence, a1 + A2 +. + A50 = 200, A51 + a52 +. + A100 = 2700, then what is A1 equal to
• 13. The problem of discontinuity The number of discontinuities of function f (x) = SiNx / x + e ^ X / 1-x is? When x = 0, there is a discontinuous point? Why is this? Is the point function undefined, or does the limit not exist, or does the limit exist but not equal to the value of the point function? 1-x is the denominator as a whole. Why isn't the function defined at 0?
• 14. Divide a 5-meter-long rope into seven sections. How many meters long is each section? Pay attention to the name of the unit with meters! Try to play as complete as possible!
• 15. Divide the 3-meter-long rope into 7 sections, each section is () meters long, and each section is a fraction of the total length
• 16. The 6-meter-long rope is divided into seven sections, each of which accounts for several parts of the total length, and each section is several parts of the length
• 17. Divide the 3-meter-long rope into 7 sections. How much is the length of each section? How many meters is the length of each section?
• 18. Divide an 8 / 9 meter rope into four sections. What's the length of each section? What's the length of each section
• 19. Cut a 3-meter-long rope into 4 sections on average, and each section accounts for 3 meters of () (), each section is () () meters, which is 1 meter of () ()
• 20. Cut the 5-meter-long rope into 8 sections on average. How long is each section? How many parts of each section?