Either a low injection pressure or a leakage of piston rings is able to lead （）.

A . prolong the ignition delay period B . ensure the beginning of fuel injection C . thoroughly utilize the air charge D . allow controlled fuel combustio

A . camshaft B . crankshaft C . governor D . flywheel

A . is B . has C . are D . wa

A . fuel will not be properly atomized in the cylinder B . ignition will be delayed due to low ignition temperature C . maximum fuel expansion will occur on the compression stroke D . fuel will ignite before top dead center

A . the exhaust will be clear B . fuel consumption will be low C . all the fuel will be burned at top dead center D . fuel consumption will be high

A . smoother engine operation B . advanced fuel ignition C . increased fuel economy D . reduced engine power

A . the piston is just coming upward from the bottom dead center B . the piston has moved about one-fifth of the way up C . the piston has moved most of the way up and almost reached the TDC D . the piston has just past the TDC

A . erosion and cratering of the nozzle orifices B . fuel leakage into the nozzle drain line C . fuel leakage before and after injection D . insufficient fuel delivery though that nozzle

A . The fuel metering will vary B . The fuel will explode C . The cylinder head will crack D . The engine will sto

A . no fuel will be delivered through the nozzle B . the nozzle will overheat and crack C . time of injection will change D . fuel will leak into the drain line

A . by injection pumps B . at a time decided by the injection pump timing C . by a signal opening the magnetic valves D . at a time decided by the cam directly

A . Identify potential problem areas B . Define intended coverage areas C . Access compliance with local building codes D . Determine the final location of APs and antennas E . Identify sources of RF signal attenuation and RF interference

A . put out B . put on C . take off D . take i

A . a little lower B . a little higher C . too low D . exactly the same

A . only the replacement of the entire pump would be acceptable B . the injection pump and injection nozzle must be replaced C . either the barrel or plunger must be replaced D . the barrel and plunger must be replaced as a unit

A . the firing pressure in the cylinder B . a metering helix inside the pump C . varying the physical length of the plunger stroke D . varying the clearance between the injector cam and the injector rocker arm

A . high exhaust temperature B . low exhaust temperature C . fuel knock in each cylinder D . mechanical knock in each cylinder

大货样的英文是() A．approvalsample B．pre-productionsample C．labdip D．productionsample

Pre-sequences are a fundamental unit of conversational structure.()