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單項(xiàng)選擇題

The oil （） in the discharging water from oil water separator exceeds 15 PPM without alarm, because the coil was burnt out.

A.filter
B.hole
C.pollution
D.content

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單項(xiàng)選擇題

The internal part of boiler should be cleaned by yard if found （）.

A.scaled
B.worn
C.deformed
D.rested

單項(xiàng)選擇題

At normal sea going, we use （） instead of donkey boiler.

A.a heater
B.a pre-heater
C.an exhaust gas boiler
D.the coal burning boiler

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