5.2在电动机的继电器接触器控制电路中,零压保护的功能是(    ) A.
防止电源电压降低而烧坏电动机   
B.
实现短路保护

C.
防止停电后再恢复供电时电动机自行启动

They not only posed influence on the ceramics industrie...

单项选择题They not only posed influence on the ceramics industries of the Korean peninsula, Japan, Vietnam, Thailand, Iran, Turkey and others, even the _______ of these areas were influenced by the export wares.
A、cultural exchange
B、clothing style
C、painting and decorative arts
D、writing habits

A、 B、 C、 D、

单项选择题
A、
B、
C、
D、

A． B． C． D．

单项选择题

A．
B．
C．
D．