整机解体清洁度的检查部位是发动机各零部件所有加工表面。

动词填空。

1. Daniel needn't _____ (finish) his homework now and he can do it after school.

2. It's bad _____ ( not take) exercise for some time a day.

3. Try this kind of mango, and I'm sure you ____  (like) it.

4. We will go to the cinema if it _____ (be) sunny tomorrow.

5. Look! Tom _____ (play) with his parrot.

6. The skirt makes her _____ (look) pretty.

7. I _____ (take) the photo in Beijing two years ago.

8. He spends more than two hours _____ (do) his homework every day.

专门机关与广大群众相结合的方针，是指导公安机关和人民警察各项活动的基本方针，贯穿于公安工作的各个方面，被( )所确认，并体现在公安人员的纪律中。

A．公安政策

B．公安纪律

C．公安法规

D．公安原则

学龄前儿童膳食中优质蛋白质应占蛋白质总量的( )。

A．20%

B．30%

C．40%

D．50%

在序数效用理论中，用来表示消费者偏好的曲线是（）。

A．预算约束线

B．平均成本线

C．无差异曲线

D．等产量线

什么叫雷电反击？预防雷电反击方法。