在△ABC中，已知a：b：c=3：4：5，在边AB上任取一点M，则△AMC是钝角

When I was passing his room, I happened to notice him _____ by his parents.[ ]

A. beat

B. beaten

C. being beaten

D. beating

连词成句。

1. an, this, story, interesting, is 

   ________________________________________

2. do, fruit, you, best, what, like

   ________________________________________

3. in, he, football, does, playing, well

   ________________________________________

4. the, morning, I, him, sing, heard, song, this

   ________________________________________

5. an, all, boy, he, we, is, think, honest

   ________________________________________

连词成句。

1. have, ears, you, don't (?)

______________________________________

2. going, turn, I'm, to, up, it (.) 

______________________________________

3. he, down, turning, is, it (.) 

______________________________________

4. my, show, here's, favourite, radio (.)

______________________________________

下列叙述中正确的是

A．接口复杂的模块，其耦合程度一定低

B．耦合程度弱的模块，其内聚程度一定低

C．耦合程度弱的模块，其内聚程度一定高

D．上述三种说法都不对

后向散射光信号极其微弱，一般采用统计平均的方法来提高信噪比，平均时间的设置3min获得取比1min获得取提高（）的动态。

A.0.5db

B.0.8db

C.1.2db

D.0.9db