A、A.provide a reservoir for cylinder lubrication
B、B.pump oil into the combustion space for cylinder cooling
C、C.prevent excessive lubricating oil consumption
D、D.allow hydraulic oil film formation on the cylinder
更多“The primary purpose of oil control rings on a diesel piston is to（）”相关的问题
A、provide energy to operate the engine between power impulses B、neutralize the primary inertia force of the crankshaft C、reduce the shock of starting loads on the main bearings D、prevent the engine from operating at critical speed
A、to use the classification to route traffic B、to use the classification to reorder packets from various sources C、to use the classification to discard malformed packets D、to use the classification to provide the configured service level
A、containers are classified as general purpose (dry cargo) container and specific purpose container B、general purpose container (GP) is suitable for the widest varieties of cargo C、specific purpose container is suitable for the specific cargo D、bulk container， reefer container， open-top container are all general purpose containers
A、containers are classified as general purpose (dry cargo) container and specific purpose container B、general purpose container (GP) is suitable for the widest varieties of cargo C、specific purpose container is suitable for the specific cargo D、bulk container， reefer container， open-top container are all general purpose containers
A、A. to create a partial mesh of VPN sites B、B. to remove MPLS from VPNs C、C. to create a point to multipoint topology D、D. to enable IPsec accross the VPN
A、The primary line module is inactive for five minutes and then becomes active. B、The primary line module is in standby mode，while the spare line module remains active. C、The primary line module becomes active immediately and the spare line module becomes inactive. D、The primary and spare line modules are active for five minutes，after which time the spare line module becomes inactive.
A、Maintains proper speaker phase B、Protects the amplifier from damage C、Protects the digital systems from damage D、Amplifies the speaker signal
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