强夯法一般不宜加固（）。

A、粘性土 

B、碎石土 

C、杂填土 

D、弱风化岩

If more than one raft is manned after the vessel has sunk，you should（）.

A.Go in a different direction in search of land

B.Spread out to increase the possibility of a search aircraft finding you

C.Reduce the number of rafts by getting as many people as possible into as few rafts as possible

D.Tie the rafts together and try to stay in a single group