委托代征是指按照税法规定，负有扣缴税款的法定义务人，在向纳税人支付款项时，从所支付的

砂型铸造用的型砂应具备的主要性能有（），透气性，（），退让性。

电离辐射是指量子能量( )时引起物体电离的电磁辐射。

A．小于12eV

B．大于12eV

C．小于10eV

D．大于10eV

支配上直肌的颅内神经是（）

A.三叉神经

B.滑车神经

C.外展神经

D.动眼神经上支

E.动眼神经下支

口语运用。

根据情景，从所给七个选项中选出五个完成对话

A：Good morning，Kate.

B：Good morning，Helen. How was the party last night? 1. __________

A：Yes. There was lots of fun.

B：What about Alice？2. __________

A：Yes. She enjoyed it a lot, too. By the way, I didn't see you. Where were you？

B：Me？Oh, 3. __________

A：What for?

B：There was a basketball match between Class 1 and Class 3. I really prefer watching a basketball |

match to going to a party.

A：4. __________

B：It is exciting. It is a very close match.

A：5. __________

B：Class 1 won the match. 76 to 74.

A：Oh! That’s really great!

A. Where were you?

B. Was she there?

C. I went to the school gym.

D. Did you have a good time?

E. What was the result?

F. What do you think of the match?

G. When did the match begin?

将你一只手的食指浸人水中，请设计一个实验测出食指受到的浮力．

（ 1 ）写出你所需要的实验器材：______

（ 2 ）简述实验主要步骤，要求写出所要测量或记录的物理量（用字母表示）．

实验步骤：用______测出空烧杯的______；向______中灌满水，然后将食指插入，

用______盛接排出的水；______测出水和烧杯的总质量______

（ 3 ）F_浮的表达式是______（用字母表示）．