单项选择题
A.1353±3mm B.1053mm C.1435mm
A.3W-16/9 B.NPT5 C.7C1/63
A.阴极、阳极、控制极 B.阴极、阳极、集电极 C.阴极、集电极、基极
A.1 B.2 C.3 D.4
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