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12.X光管的燈絲為了增強其電子熱釋出效率及延長光管的壽命,常在燈絲材料內加入1%至2%的何種元素? (A)鉬(Mo) (B)釷(Th) (C)鉭(Ta) (D)石墨(C)
問題詳情
12.X光管的燈絲為了增強其電子熱釋出效率及延長光管的壽命,常在燈絲材料內加入1%至2%的何種元素?
(A)鉬(Mo)
(B)釷(Th)
(C)鉭(Ta)
(D)石墨(C)
參考答案
答案:B
難度:簡單0.764368
統計:A(5),B(133),C(6),D(17),E(0)
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