为使拉杆不承受扭转力，在拉紧螺母时必须防止拉杆随之转动产生（）。

用所给词的适当形式填空。

1. When              the car             (invent)?

2. What do you think              (be ) the most helpful invention?

3. A stranger was seen              (go) into the teacher's office by the girl.

4. Knocking into players and falling down would be              . (danger)

5. I am              (save) my money so I can buy a new bicycle.

6.             (be) a volunteer is great.

7. I fix up bikes and give               (they)away to children.

8. I love places where the people are really              (friend)

9. I love singers              (whom) write their own music.

10. Teenagers should              (allow) to choose their own clothes.

十枣汤中善行经隧水湿的药物是（），善泄脏腑水湿的药物是（），善消胸胁伏饮痰癖的药物是芫花（）。

一级沉淀池通常可去除可沉降颗粒物的( )。

A．60%～65%

B．70%～75%

C．80%～85%

D．90%～95%

四逆汤中附子生用，回阳救急汤中附子熟制，故温壮元阳，祛寒破阴之力，四逆汤要强于回阳救急汤。

影响排土场稳定性的因素有哪些？