题目内容

Each of the following is a part of the cathode assembly except ____.

A. Filament
B. Stator
C. Focusing Cup
D. Associated Wiring

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A. Numbers 1 & 3 only
B. Numbers 2 & 3 only
C. Numbers 1 & 4 only
D. Numbers 2 & 4 only

A. Tungsten
B. Lead
Copper
D. Aluminum

A. Quick to heat up.
B. To achieve a uniform X-ray intensity distribution.
C. Easy to manufacture
D. To produce enough filament current.

A. Control leakage radiation.
B. Provide a vacuum.
Cool the tube.
D. Ensure against electric shock.