（1-1/6）×（1-1/6）×（1-1/7）×（1-1/9）的值是（）。A．1/1

人民警察纪律，是指根据人民警察职业特点而制定的，要求人民警察在行使权利时必须遵守的义务性行为规范的总称。 ( )

What did the author think of his mother

A．She was stubborn.

B．She was p.

C．She did not care him very much.

D．She was not very intelligent.

Our parents have done a lot for us. I think we should ______ them by working hard.

A．relieve

B．repay

C．submit

D．respect

我国沿海地区最常见的一种食物中毒由何菌所致（）

A.金黄色葡萄球菌

B.沙门菌

C.副溶血弧菌

D.肉毒梭菌

E.产气荚膜梭菌

斜视图主要用来表达机件（）的实形。

A、倾斜部分

B、一大部分

C、一小部分

D、某一部分