当钻井液槽面见到油花时应收集直接反映油花显示情况的（）三项资料。A.原油颜色、占槽面

Miss Liu will show you around _______Mount Yuntai, because she has _____ good knowledge of it.

A．the; a

B．a; the

C．不填；a

D．the; 不填

It’s the same in China --- many people, ________ some are not overweight at all, are always going on diets or taking weight-loss pills, ________ are often dangerous.

A．whose; which

B．of which; who

C．of whom; which

D．who; that

There are six floors ______our school building. Our class is ______ the third floor.

A．in, on

B．in, in

C．on, in

D．on, on

设有如下关系表______。

则下列操作中，正确的是______。

A．T=R∩S

B．T=R∪S

C．T=RхS

D．T=R/S

标准试块的材质、形状、尺寸和人工缺陷形式与对比试块不同，主要表现在不一定有人工缺陷。