In launching a lifeboat，when should the tricing pendants be released?（）.

A.Before the boat is lowered from the stowage position

B.As soon as the boat-fall blocks clear the davit head

C.After the limit switch is activated

D.After all people have been embarked

以下安全标志的含义是（）？

A.提示有┦字形交叉路

B.提示有Y字形交叉路

C.提示左面有车道并入

D.提醒有优先道路