从蹄走腹并上行至胸部的经脉是（）
A.后肢三阳经
B.后肢三阴经
C.前肢三阳经
D.前肢三阴经
E.前肢太阴肺经
参考答案：B
Many a woman______ important positions in society, which________impossible in the past．
A．holds; was
B．hold ; were
C．held; was
D．holding; were
充砂加热弯管，弯头的最小弯曲半径不小于该管外径的（）倍。
