During repair,lubrication lines and orifices must be （）.

[单选题]D．uring the dock repair, when installing the tail shaft and propeller, _____ should be on the spot for supervisingA．chief engineerB．engineerC．captainD．any member of the engine department

[单选题]D．uring the dock repair,______should be measured firstly before tail shaft drawn out.A．the sinking of tail shaftB．the clearance of stern bearingC．the total flexure of shaftD．main engine crankshaft deflection

[单选题]D．uring the dock repair, when installing the tail shaft and propeller, ____ should be on the spot for supervisingA．chief engineerB．engineerC．captainD．any member of the engine department

[名词解释] 修复(repair)

[单选题]Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）, so that surfaces dont get touch with each other.A . gravityB . motionC . ratioD . density

[单选题]keep the lines tightA．保持缆绳受力B．谨防断缆C．单绑D．挽牢

[单选题]Lubrication for the main reduction gears used with diesel engines is usually supplied byA．oil from the main engine sumpB．an independent lube oil systemC．the stern bearing head tankD．the stem bearing sump tank

[单选题]Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.A．The direction of pressure on the journal in four-stroke engine is continuou

[名词解释] 英译汉：lubrication

[单选题]The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the （） caused by the friction at the bearings.A . acidsB . additivesC . heatD . gear