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。