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【判断题】
交-直-交变频器将工频交流电整流为直流电，然后再由直流电逆变为所需频率的交流电。（ ）A.
正确
B.
错误
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举一反三
【简答题】Where was I? The room was dark and quiet. My head hurt really badly. I shouted, “Help! Help! Can anybody help me?” After a while somebody came in. The room was so dark that I couldn’t see his face cle...
【单选题】下列情况下，不宜采用简化分批法的是（ ）。
A.
各月间接计入费用水平相差不大
B.
月末未完工产品批数较多
C.
同一月份投产的批数很多
D.
各月间接费用水平差异较大
【单选题】Why are you charging me for two whiskies from the mini-bar? I _______alcohol.
A.
won't drink
B.
don't drink
C.
can't drink
D.
couldn't drink
【单选题】Why are you charging me for a receiving fax? I should pay only if I ________one.
A.
send
B.
sent
C.
have sent
D.
has sent
【单选题】Why are you charging me for two whiskies from the mini-bar? I _______alcohol.
A.
Won’t drink
B.
don’t drink
C.
can’t drink
D.
couldn’t drink
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