鞘膜积液手术治疗，最常用的手术方法是（）.
A.鞘膜翻转术
B.鞘膜折叠术
C.鞘膜切开术
D.鞘膜开窗术
E.鞘膜切除术
参考答案：A
We _______ pay to get into the concert. It's free.
A．can't
B．mustn't
C．might not
D．don't have to
增强肌力的最佳方法是
A．等长收缩B．等张收缩C．等速练习D．主动运动E．低频电刺激
