on both the external and internal top edges
on both the external top and bottom edges
on both the external and internal bottom edges
on all the four edges
第1题：
clogged coolant passages
a leaking cylinder head gasket
low fuel oil pressure
worn or broken cylinder liner sealing rings
第2题：
clogged fuel injection pumps
increased cylinder liner wear
intake valve stem corrosion
varnish deposit on pistons
第3题：
Diesel engine blow-by is the leakage of combustion gases past the( ).
A.oil rings only
B.compression and scraper rings
C.cylinder liner sealing
D.cylinder liner ring grooves
第4题：
low compression pressure
increased piston wear
increased cylinder lube oil consumption
poor contact between compression rings and liner
第5题：
an oil seal
removing heat
a gas seal
cooling the piston
第6题：
the same, whether at sea, or during maneuvering
adjusted during each hour of operation while at constant RPM
higher at sea than while maneuvering
lower at sea than while maneuvering
第7题：
provide a reservoir for cylinder lubrication
pump oil into the combustion space for cylinder cooling
prevent excessive lubricating oil consumption
allow hydraulic oil film formation on the cylinder
第8题：
Low compression in a diesel engine could be caused by
A.worn or broken cylinder liner sealing rings
B.high cooling water temperature
C.worn or broken piston rings
D.low fuel oil pressure
第9题：
additives
water
grease
acid solution
第10题：
facilitate the installation of piston rings
allow for the expansion of the piston during operation
prevent crankcase vapors from entering the combustion chamber
reduce wearing of the upper cylinder liner