下列实验室制取气体的原料选择不正确的是（    ）

两个容器完全相同，分别盛有甲、乙两种液体，两个完全相同的小球分别静止在液体中，所处位置如图3所示且两液面相平。下列关于两种液体对容器底部的压强p_甲、p_乙以及两个小球受到的浮力F_甲、F_乙的大小比较中，正确的是（   ）

写出反义词。

傍晚—____       美妙—____          立刻—____        悉心—____

如图所示，用沿斜面向上2N的拉力，把重为5N的物体匀速拉到高处，请画出拉力的示意图和物体重力对支点O的力臂

 many nice coats! I can't decide which one to buy.

B: ____

A: Oh, it looks nice. ____

B: Let me see. It's more than 400 yuan.

A: It's too expensive. I prefer the pink one. ____

B: ____I know you want to appear special.

A : Good idea ! ____

B: It's a silk one.

A: Perfect. I'll try it on.

A: What's it made of?

B: How about the green one?

C: What do you think of it?

D: It’s OK, but why not try on a Chinese Tang costume?

E. How much is it?