The necessary conditions for producing x-rays are : ()
A. high voltage power supply and low voltage power supply
B. high voltage power supply and X-ray tube
C. high voltage power supply and suitable target material
D. high speed electrons beam and proper target
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What factor determines the shortest wavelength in a continuous X - ray spectrum? ( )
A. the current in the tube
B. the target material
C. the size of the target
D. the voltage of the tube
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B. 不是,好歹不分
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