To launch a liferaft by hand you should（）.

A.cut the casing bands，throw the liferaft over the side，and it will then inflate

B.detach the operating cord，throw the raft over the side，and it will then inflate

C.cut the casing bands，throw the raft over the side，and pull the operating cord

D.throw the liferaft over the side and pull the operating cord

提高企业经济效益的最主要途径是加强（）管理。

A.资金

B.材料

C.设备

D.技术