桑寄生具有的功效是
A.祛风湿,强筋骨,养血安胎B.祛风湿,强筋骨,通经脉C.祛风湿,强筋骨,利尿消肿D.祛风湿,止痛,利尿消肿E.祛风湿,退虚热,清湿热
参考答案:A
24.________fit, we ought to learn more about our body and be careful with what we eat.
A.Keeping
B.To keep
C.Having kept.
D.To have kept
某阳离子Mn+的核外共有x个电子,核内有a个中子,则M的质量数为
A.a+x-n
B.a+x+n
C.a-x-n
D.a-x+n