题目内容

Thermionic emission is electrons being boiled off and creates something called ____.

A. Space emissions
B. Static charge
C. Space charge
D. X-ray

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

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