曲池在五输穴中,属()
A.井穴
B.荥穴
C.合穴
D.经穴
E.输穴
参考答案:C
Many were killed in the coal accident; ________, 23 lost their lives.[ ]
A. to be exact
B. on the contrary
C. in particular
D. to be honest
空气中的氮气体积含量为()。
A、75%
B、79%
C、85%
D、70%