简述一下CO2气体保护焊主要优点。

When you are working in machinery spaces, you should wear()in order to protect your body.

A. a safety helmet
B. well fitting clothes
C. eyeglasses

The crankshaft of diesel engine is supported by ()

A. tie rods
B. through bolts
C. main bearings

We are loading inflammable cargo. No one _____ smoke on deck.

A. can
B. can’t
C. will

_______ are used to protect your hea

A. Helmets
B. Safety goggles
C. Safety boots

During the inspection, the starting air valves should be closed () the engine from running

A. to increase
B. to prevent
C. to reduce

The ()_ of the liferaft is sufficient for all of you.

A. speed
B. capacity
C. capstan

Find a correct English name for “螺帽”.

A. nut
B. crowbar
C. nail

The outer part of the cylinder is called （).

A. cylinder liner
B. cylinder cover
C. cylinder jacket

Could you tell me the daily consumption of lube oil？

A. 5 tons per day
B. Three days
C. One time a day