微电脑用的主板机（不带CPU）
参考答案：34（8473.3090）
补全对话。
A: Hi! Good morning.
B: Good morning. __1__?
A: My name is Tom. Nice to meet you.
B: __2__.
A: Excuse me. Do you have an English tape?
B: An English tape? __3__.
A: Is it on your desk?
B: No, it isn't.
A: __4__?
B: I think (认为) it's under my chair.
A: __5__.
B: You're welcome (不用谢).
体积为V的油滴，落在平静的水面上，扩展成面积为S的单分子油膜，则该油滴的分子直径约为________ 。已知阿伏加德罗常数为NA，油的摩尔质量为M，则一个油分子的质量为____ ．
