问题
选择题
如图所示，电磁继电器能通过低压控制电路间接地控制高压工作电路．下列说法正确的是
A．连有电动机的电路是低压控制电路
B．电磁继电器实际上是一个由电磁铁控制电路通断的开关
C．利用电磁继电器主要是为了节约用电
D．利用电磁继电器主要是为了操作方便
答案
答案：B
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如图所示，电磁继电器能通过低压控制电路间接地控制高压工作电路．下列说法正确的是
A．连有电动机的电路是低压控制电路
B．电磁继电器实际上是一个由电磁铁控制电路通断的开关
C．利用电磁继电器主要是为了节约用电
D．利用电磁继电器主要是为了操作方便
答案：B
| 选择适当的单词填空完成短文。 | |||
| Mary comes 1___________ Australia. She is twelve. She is in China 2___________ her family now. She is a student. She 3___________ her school and her classmates. She speaks Chinese, but she 4___________ speak Chinese very well. Mary gets up very early 5___________ the morning. She has milk and bread 6___________ breakfast. Then she goes to school by bike. In the evening she does her homework and reads books. She 7___________ to bed 8___________ 9: 00. She is very 9___________ every day.
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