在﹣3、0、4、0.5这四个数中最小的数是（　　）

一辆小汽车陷进了泥潭，司机按图所示的甲、乙两种方式安装滑轮，均可能将小汽车从泥潭中拉出. 你认为甲方式中滑轮的的作用是____；设两种方式将汽车拉出的最小力的大小分别是F₁、F₂ ；则F₁ ____F₂（填“＞”“＜”或“＝”）；如按乙方式，人拉绳头移动了0.5m，那么小汽车被拉动了____ m．

下列化学用语与含义不相符的是（　　）

写出与问句相对应的答句。

①Where are the boys?____           A. Yes, they are.

②Are they on the table?____          B. They're in the classroom.

③How much is your book?____        C. Yes. Here you are.

④Can I have some fish ?____          D. I'd like a glass of water.

⑤What would you like?____           E. Eight yuan.