After "F.W.E" is given, the air system is shut down, the （） gear put in, all drains and indicator cocks opened, and the cooling water kept running.

A.the main bearing
B.the cylinder cover
C.the entablature
D.the sump

A.connecting rods
B.piston rods
C.tie rods
D.jack-bolts

A.advanced nautical equipment
B.advanced performance main engines
C.emergency equipment
D.communication and language skills