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【简答题】
用数对表示物体位置时,先写( ),再写( ),中间用逗号隔开。
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皮皮学刷刷变学霸
举一反三
【简答题】植物检疫主要业务范围包括 、 、 、 和旅客携带物等。
【单选题】An electron is moving through space at a speed close to the speed of light. At one instant in time, its momentum is kg m/s. It experiences an electric force of N. After a time of 3 ns ( s), what is th...
A.
kg m/s
B.
kg m/s
C.
kg m/s
D.
kg m/s
【单选题】In which orbital does an electron in a phosphorus atom experience the greatest shielding __________?
A.
2p
B.
3s
C.
3p
D.
2s
E.
1s
【简答题】测量二次回路的绝缘电阻用（）V兆欧表，亦可用500V兆欧表代替。
【单选题】Which of the following (n, , , ms) combinations is impossible for an electron in an atom?
A.
5,3,-2,1/2
B.
3,1,0,-1/2
C.
3,1,2,1/2
D.
2,1,0,-1/2
【判断题】对二次回路，1kV及以下配电装置和电力布线测量绝缘电阻，并兼有进行耐压试验的目的时，当回路绝缘电阻在10MΩ以上者，可采用2500V兆欧表一并进行测试，试验持续时间1min。
A.
正确
B.
错误
【简答题】The transitions labelled (A) to (E) in the figure below represent an electron moving between energy levels in a hydrogen atom. Answer the following questions. 1. Which transition represents an electro...
【单选题】An electron (charge = −1.6 × C) is moving at 3 × m/s in the positive x direction. A magnetic field of 0.8T is in the positive z direction. The magnetic force on the electron is:
A.
4 × N, in the positive z direction
B.
4 × N, in the negative z direction
C.
4 × N,in the positive y direction
D.
4 × N, in the negative y direction
【单选题】A student is asked to study two photographs, taken at the same magnification, of a palisade mesophyll cell, one using a high quality light microscope and the other using an electron microscope. The st...
A.
1, 2 and 3
B.
1, 2 and 4
C.
1, 3 and 4
D.
2, 3 and 4
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