It is necessary to make sure that there are no loose parts left in the crankcase before using the turning gear because ______.
A: some parts of the running gear have been dismantled
B: during dismantling work, lubrication lines and orifices are sealed
off
C: loose parts jammed in the crankcase are likely to cause damage
D: pipes are relieved of pressure before the repair work
A: some parts of the running gear have been dismantled
B: during dismantling work, lubrication lines and orifices are sealed
off
C: loose parts jammed in the crankcase are likely to cause damage
D: pipes are relieved of pressure before the repair work
C
举一反三
- The crankcase can not be opened （）the parts have been cooled down.
- All deck machinery require routine maintenance work, including splash lubrication for all totally enclosed working parts, lubricating open gears and clutches with open gear compound and ____. A: oiling the bearings with lubricant from the forced feed system B: greasing bearings on the shafts with high pressure guns C: painting the exposed parts with anti-corrosion D: disassembling the moving parts once every two months
- Put in the engine turning gear Now examine thoroughly inside the crankcase to （） that everything is correct.
- ______ so many people put of work as today. A: Before have never there been B: There have been never before C: Never before have there been D: Have there never before been
- Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except______.
内容
- 0
__________ to some parts of South America is still difficult, because parts of the continent are still covered with thick forests.
- 1
Before starting the turning gear, _____ should be worked by hand to minimize corrosive action on the liners.
- 2
He cleaned the old machine and _______ the moving parts with a little mineral oil, hoping that it could work again.( ) A: lubricated B: lubrication C: lubricate D: lubricating
- 3
After the engine is warmed, we should ()the turning gear before<br/>starting the engine. A: take in B: put in C: take out D: put out
- 4
It is so difficult to ______ the bottom of the ocean because some parts are very deep.