單項(xiàng)選擇題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.steering
B.timing
C.turning
D.running


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1.單項(xiàng)選擇題A-frames are mounted on the bed plate and support () and cylinder block.

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

2.單項(xiàng)選擇題A-frames and cylinder block is held together by () to form a rigid structure.

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

3.單項(xiàng)選擇題Administrations should bear in mind the significance of () in maintaining safety of life and property at sea and in preventing marine pollution.

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

4.單項(xiàng)選擇題Adjust () by means of lead wire.

A.the clearance of the main bearing
B.the diameter of main bearing
C.the gap of main beating
D.the tolerance of main bearing

5.單項(xiàng)選擇題Additives () protective layers on metal surfaces guarding them against corrosion.

A.damage
B.form
C.dissolve
D.contaminate