They stood chatting together as easily and naturally as _____
A.
it could be
B.
could be
C.
It was
D.
was
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【简答题】有一台三相异步电动机,其铭牌数据如下: P N /KW n N /r·min -1 U N /V η N ×100 cosphi _{N} frac{I_{st}}{I_{N}} frac{T_{st}}{T_{N}} frac{T_{max}}{T_{N}} 接法 40 1470 380 90 0.9 6.5 1.2 2.0 △ (1)当负载转矩为250N·m时,试问在U=U N 和U'=0.8...