在大椎穴处相交会的经脉有
A．手三阳经
B．足三阳经
C．冲脉
D．督脉
参考答案：A,B,D
The wrong you've done to him is terrible,for__________ you should make an apology to him, I think.
A．this
B．which
C．what
D．that
简述马氏体的形成及其力学性能。
