以下哪几种适宜使用颈椎病牵引（）
A.严重颈椎失稳
B.椎间孔变形
C.脊髓严重受压
D.椎动脉扭曲
E.交感型颈椎病急性期
参考答案：B, D
简述戈尔德斯密特类质同象法则？
There is a fire aft aboard your vessel. To help fight the fire，you should（）.
A.put the wind off either beam
B.head the bow into the wind and decrease speed
C.put the stern into the wind and increase speed
D.put the stern into the wind and decrease speed
