为保证施工质量，钢筋混凝土板中受力钢筋间距不宜小于（）mm.   A.50； B.6

比的后项一定，比的前项和比值成反比例．______．（判断对错）

衡量一个国家或地区城市化水平的标志是 [ ]

A．城市的数量

B．城市人口数量

C．城市的规模

D．城市人口占总人口数的比重

Kate: Can you tell me more about your school life, Amy?

Amy: S   小题1:    . I go to school at a q  小题2:  past seven. Our classes s 小题3:   at 8 a.m.

Kate: What is your f 小题4:   subject?

Amy: I’m good at G  小题5:  . I like to learn about the w   小题6: .

Kate: Do you have many friends at school?

Amy: Yes! I have a lot of friends. We always have f   小题7: in the playground after c 小题8:   .

Kate: Do you get a lot of h  小题9:  ?

Amy: Yes, but I don’t mind. It’s good for us to p 小题10:   !

封闭式基金一般采用（）方式分红。

A．股票股利

B．配股

C．现金

D．转股

只要接触物体粗糙表面，就会产生静摩擦力。