單項(xiàng)選擇題Anchor() are used in some installations where the cable lifter rotates about a vertical axis.

A.windlasses
B.drums
C.capstans
D.warp ends


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1.單項(xiàng)選擇題Grease the roller bearings with HPgun In the sentence “HP” means ().

A.horse power
B.high pressure compressor
C.hand pump
D.high pressure

4.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

5.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