一般适用于清洁介质，对于带固体颗粒和黏性较大的介质不适用的阀门是（）。
A．止回阀
B．截止阀
C．闸阀
D．球阀
参考答案：A
-----What do you think of the girl?
------Not only _______ hard but also_____ very charming.
A．does she work ; is she
B．she works ; she is
C．does she work ; she is
D．she works ;is she
中药的性能概括为（）
A.四气、五味
B.升降、浮沉、归经
C.偏阴或偏阳
D.有毒无毒
