脑积水的脑脊液通常为多少毫升：A．100～150ml B．200～300ml C．3

用所给词的正确形式填空。

1. September is the ______(nine) month of the year.

2. The boy from Class Two was the first past the ______(finish) line.

3. Last year, we planted ______(hundred) of trees in our village.

4. His father taught ______(he) French when he was seven years old.

5. The girl is writing a diary ______(careful) now.

6. I ______(work) all night writing an important report for the next meeting.

7. Everyone makes _______ (mistake) in his life.

8. Thank you for ______ us so much (help).

9. This music is so ______ (difficulty) to play.

10. To ______ (he) surprise, his dog was saved in the end.

（6分）如图是a、b两种固体物质的溶解度曲线，试回答：

（1）t℃时，两物质的溶解度的大小关系: a      b(填“大于”、“等于”或“小于”)

（2）当a中含有少量b时，可以用     法提纯a

（3）在    ℃时a、b的溶解度相等，在此温度下150g水中最多可溶解a物质      g。

（4）要使饱和的a溶液变为不饱和，可采取的措施是        、              。

公司与合伙的最大区别在于，公司具有（）。

A.资合性

B.人合性

C.盈利性

D.效率性

麻疹传染性最强的时期为

A．潜伏期

B．前驱期和出疹期

C．出疹第5天

D．恢复期

E．有并发症时

塑料管道与地下给水管（管径300mm及以下）平行净距为（）m？

A、1m

B、2m

C、0.5m

D、0.6m