耗能电子元器件有()。
A、电阻
B、电容
C、电感
D、二极管
参考答案:A
“How __ he ___ that?” all of them shouted
A.dare, said
B.dared, says
C.did, dared to say
D.did, dare to say
辅机的密封有动密封和静密封。