听力原文:M: Jessica, could you send these e-mails to all the club members? W: Sorry, the computer broke down this morning. I will do it for you as soon as I have it fixed. Q: What docs the woman imply? (5)
A.
She has to post a letter instead.
B.
She has to turn down the man's request.
C.
She's not sure if the computer is fixed.
D.
She can't send the message right now.
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【简答题】三相桥式全控整流电路中,共阴极组晶闸管的触发脉冲相差____ O ;位于同一相的两只晶闸管的触发脉冲相差____ O 。