下列化合物中,属于共价化合物的是( )
A.MgF2
B.SO2
C.Na2O
D.K2S
答案:B
眩晕痰湿中阻证的主要症状有()
A.头重昏蒙
B.视物旋转
C.呕吐痰诞
D.少寐多梦
E.舌苔白腻
There is a general ______ that pouring old wine into the same bottles is the wrong way to go.
A. consensus B. census C. censorship D. conscience