The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.

[单选题]In the navigation,_______cause the shafting over load most easilyA．stopping the main engine suddenlyB．changing the main engine running direction suddenlyC．the sailing from the shallow water area to the deep water areaD．the ship's trim too much

[单选题][A] objection [B] projection [C] project [D] object

[单选题]The （） of the main shaft should be measured with a （）.A . clearance；calipersB . sinking；bridge gaugeC . diameter；bridge gaugeD . clearance；lead wire

[单选题]On opposite ends of a single shaft of a turboblower are a gas driven （）and a air compressor, which are sealed each other.A . charge air receiverB . scavenging air beltC . turbineD . air cooler

[单选题]Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）.A . inside micrometerB . feeler gaugeC . adjustable trammelD . sighting device

[单选题]Sealing in pump shaft is achieved by means of the ( ).A．gasketB．packingC．o-ring

[名词解释] 英译汉：main shaft

[单选题]A wobbling tail shaft is an indication of（）.A . shallow waterB . an engine that is misfiringC . a tight tail shaft glandD . worn stern bearing or misalignment

[单选题]When the tail-shaft is drawn from a vessel in dry-dock, which of the following inspections is required to be carried out?A．The propeller hub taper and shaft keyway should be inspected for cracks or corrosionB．The stern bearing alignment with the ster

[单选题]Where a propeller shaft passes through the hull，water is prevented from entering by means of a（）.A . stuffing boxB . propeller bossC . seacockD . stop-water