干燥环境中的混凝土，应优先选用的常用水泥是（）。A.硅酸盐水泥 B.矿渣水泥 C.普

清除钻孔内金属碎屑时，必须先停止钻头的转动。（）用手直接清除铁屑，使用钻床，（）戴手套。

A.应该、不准

B.应该、可以

C.不准、不准

D.不准、可以

治疗痰湿蒙蔽清窍所致的神昏，宜选（）

A.石菖蒲

B.石膏

C.冰片

D.蒲黄

E.藿香

机械手表的分针与秒针从重合至第二次重合，中间经历的时间为( 　　)

A．

B．

C．

D．

Dick's mother asked him               when she saw his left hand bleeding. [ ]

A. what was the mater with him

B. what the matter was with him

C. what was matter with him

D. what matter was with him

秦艽的临床应用是（）

A.浮肿

B.小儿急性黄疸型肝炎

C.心绞痛

D.便秘

E.贫血