房室结折返性心动过速通常是通过（）

A.以上都不对

B.快路径下传，再由快路径逆传

C.快径路下传，慢径路逆传

D.慢路径下传，再由慢路径逆传

E.慢径路下传，快径路逆传

The cargo,when（）,should be completely covered with pastic.

A.stow

B.stowing

C.stowed

D.be stowed