單項選擇題

Water level controllers of the boiler must be kept operable to protect external steam-using plant from water “（）” danger.

A.carry off
B.carry down
C.carry on
D.carry over

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單項選擇題

The （） of the gravity disc is too big It causes oil to flow through the water outletWe changed the disc and no oil is found in the water outlet.

A.gravity
B.diameter
C.circumference
D.cylinder

單項選擇題

The designed （） is 20 tons per day, but the fresh water generator can only distil 15 tons at present.

A.displacement
B.weight
C.power
D.capacity