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【单选题】
三相鼠笼式异步电动机,可以采用定子串电阻降压启动,由于它的主要缺点是( ),所以很少采用此方法。A.
产生的启动转矩太大
B.
产生的启动转矩太小
C.
启动电流过大
D.
启动电流在电阻上产生的热损耗过大
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举一反三
【简答题】When I was a child ,I spent most of the time near the sea watching the ships, large and small, go in and out of the harbor. At the age of eigh I 1 home to take a job on a passenger 2 that sail...
【单选题】He spent as much time as he could _____ the child.
A.
teaching
B.
to teach
C.
teach
D.
for teaching
【单选题】The villagers spent a whole night ______ the missing child.
A.
searching for
B.
seeking after
C.
looking around
D.
finding out
【单选题】The child spent the whole afternoon ___ the riddle.
A.
figuring out
B.
figure out
C.
figuring
D.
figure
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