在实验中发生乙醚等易燃气体泄露时应对和处置方法。

A. secure the lifeboat in the davits when in the stowed position
B. bring the lifeboat close alongside the rail in the embarkation position
C. give the occupants a safety line when the boat is being lowered from the embarkation level
D. reduce the swinging of the lifeboat at the embarkation level

A. 半鞘翅
B. 缨翅
C. 鳞翅
D. 膜翅

A. 正确
B. 错误