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【单选题】
( )是在电气控制系统中发出指令或信号的操纵电器。A.
断路器
B.
控制器
C.
接触器
D.
主令电器
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【简答题】Some people have travelled to Canada while others may have just heard of it . As is known to all, the Canadian red and white maple leaf flag is officially called The National Flag of Canada. The Canad...
【简答题】The paper cup is ______________ the electric water-heater.
【单选题】You ______________ get the boiled water by yourself from the electric water-heater at the end of the carriage.
A.
may
B.
must
C.
have to
D.
can
【单选题】The ______cup is beside the electric water-heater.
A.
metal
B.
paper
C.
plastic
D.
no
【单选题】The paper cup is ______________ the electric water-heater.
A.
near
B.
beside
C.
opposite
D.
by
【判断题】As some people have quite a lot of working experiences, it is not easy for them to pick out the job they badly want.
A.
正确
B.
错误
【简答题】You ______________ get the boiled water by yourself from the electric water-heater at the end of the carriage.
【简答题】JDK 中定义了大量的异常类,这些类都是( )类的子类或间接子类。
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