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【单选题】
21,已知某一台三相异步电动机的额定数据如下:7.5kW,△接法,380V,1440 r/min,A.
sψ=0 85，η＝88%，Ist/IN＝6（Ist为电动机的起动电流,IN为额定电流)，则采用Y–△接降压起动时的启动电流为（ ）
B.
8.78A
C.
15.2A
D.
30.4A
E.
91.2A
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【单选题】You would use a(n) ________ in order to determine which of your suppliers has the best and worst records for keeping to your production schedule?
A.
MIS
B.
TPS
C.
DSS
D.
CRM
【简答题】Just how comfortable is your sofa? Would you be prepared to let a stranger crash out there for the night? And, on the basis of a bit of email correspondence and seeing a photo of the sofa belonging to...
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