国产小功率三相笼式异步电动机的转子结构最广泛采用的是()转子。
A.铜条结构
B.铸铝
C.深槽式
D.双笼式
参考答案:B
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It is said that dogs will keep you _______ as long as you want when you feel lonely .
A safety B company C friend D house
目前,通过证券交易所达成的交易,多采取( )方式。
A.双边净额清算 B.多边净额清算C.双边全额清算 D.多边全额清算