No matter how difficult things seem to be, you should say to        , “Never mind!” A positive attitude is the key to success.

A. themselves         B. ourselves            C. yourselves

对于耻骨弓角度恰当的是（）

A.正常值大于90°

B.反映骨盆出口横径的宽度

C.小于80°

D.反映中骨盆横径的宽度

E.反映骨盆出口前后径的宽度