腹试验阳性(引起腰骶痛)示()。
A、腰部神经根受压
B、骶髂关节病变
C、髋关节病变
D、以上都不是
参考答案:A
The coach is an able man, but ______ he demands too much of people. [ ]
A. on the other hand
B. on one hand
C. otherwise
D. in fact
下列各组物质中,反应后生成碱和氧气的是( )。
A.Na和H2O
B.Na2O和H2O
C.CaO和H2O
D.Na2O2和H2O