（） supplies pilot air to control the cylinder air start valves.

[单选题]The pressure of pilot air is usually （） than that of starting air.A . higherB . lowerC . lowD . high

[单选题]Usually, emergency electricity supplies to_____on boardA．Cargo winchB．WindlassC．Steering gearD．Main air compressor

[单选题]Usually, emergency electricity supplies to_______on boardA．Cargo winchB．WindlassC．Steering gearD．Main air compressor

[单选题]In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.A . piston crownB . piston ring grooveC . piston skirtD . piston ring area

[单选题]It took building supplies to construct these energy-saving houses. It took brains, too.A． other than B morethanC rather than D less than

[单选题]It was from only a few supplies that she had bought in the village the hostess cooked such a nice dinner.A． whereB．thatC．whenD．which

[单选题]Exhaust temperature increases in all cylinders, the possible cause may be（）(1) increased scavenging air temperature(2) air in fuel pumps and fuel valves(3) fouling of air and gas passagesA . (1)+(2)B . (1)+(3)C . (2)+(3)D . (1)+(2)+(3)

[单选题]It is absolutelyvital that food supplies should be [maintained.]A.preserved

[单选题]Dumped wastemight [contaminate] water supplies.A.destroyB. decreaseC. pollu

[单选题]The manager showed the new employee _____to find the supplies.A.whatB.where