【简答题】有一台鼠笼式异步电动机,其额定功率为 40 kW ,额定转速为 1450 r/min ,则该电动机的额定转差率为
【单选题】额定转速为1450 r/min的异步电动机,其额定转差率和极对数为______。
【多选题】当旅游车回到饭店时,在游客下车前地陪要向游客预报当晚和次日的()。
【单选题】额定转速为1450r/min的异步电动机,其额定转差率和极对数为______。
【单选题】额定转速为1450r/min的三相异步电动机为( )极电动机。
【单选题】国家权力体系中,( )具有明显的强制性和执行性特点。
【单选题】Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route—throug...
A.
Luckily the door was torn away in the end
B.
At last the wrench went broken
C.
The lock came open after all his efforts
D.
The chance was lost at the last minute
【单选题】额定转速为1450r/min的异步电动机,其磁极对数和额定转差率为 。
【单选题】额定转速为1450r/min的异步电动机,其额定转差率和极对数为?