行政强制执行由（）设定A、法律 B、法律、行政法规 C、法律、法规 D、法律、法规及其他规

按要求填写单词。

1. inside (反义词) _______________

2. cold (反义词)  _______________

3. worker (动词) _______________

4. that's (完整形式) _______________

5. teach (单三形式) _______________

简述锅炉锅筒（锅壳）的主要作用。

数控机床主轴驱动应满足：

A．高、低速恒转矩 

B．高、低速恒功率 

C．低速恒功率高速恒转矩 

D．低速恒转矩高速恒功率

Water is (41) important of all the things we (42) and drink. Not many people understand this, (43) it’s quite true. The human body (人体) can go (44) food for a long time, but two (45) three days without water can usually (46) people die.
Many people don’ t understand how much water the human body needs to work well and many people do not drink (47) , even (48) hot weather.
Our body is (49) water, about 65% to 75%, ff we do not have enough water, we’ll (50) tired and many will get ill. So you see, how important water is to us all.

[A] mostly[B] almost [C] most

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