H3C WA1208E可以通过PoE交换机供电，H3CPOE交换机供电方式为空闲线还

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问题单项选择题

H3C WA1208E可以通过PoE交换机供电，H3CPOE交换机供电方式为空闲线还是信号线（）

A、采用信号线供电

B、采用空闲线供电

C、信号线和空闲线都可以

D、以上都不正确

答案

参考答案：A

句型转换

句型转换（每空一词）。

1. My father often goes fishing in summer.(对画线部分提问)

your father often do in summer?

2. She often helps her mother with the housework on weekends. (改为同义句)

She often helps her mother the housework on weekends.

3. Children usually play soccer after school.(对画线部分提问)

do children play soccer after school?

4. I think watching TV too much is bad for our eyes.(改为同义句)

I think watching TV too much is _for our eyes.

5. There's some milk in the glass. (改为一般疑问句)

there milk in the glass?

单项选择题

卫星上的通信天线按覆盖面从小到大排序为（）

A.点波束天线、球波束天线、半球波束天线

B.球波束天线、半球波束天线、点波束天线

C.点波束天线、半球波束天线、球波束天线

D.半球波束天线、点波束天线、球波束天线