The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.

A . below B . in C . of D . under

A . have a larger than normal dead band B . produce excessive speed response to a load change C . respond slowly to any change in engine load D . stabilize engine speed at the new governor setting

A、the low inertia B、the high inertia C、the low velocity D、the high velocity

A . valve assembly B . standpipe manifold C . accumulator manifold D . choke manifold

A . tape face B . tapered face C . surface D . thinner face

A . arranged as close to each other as possible to save space B . arranged far away from each other for convenient operation C . be fixed or clamped to avoid vibration D . kept easy removable as to convenient repairing work

A . remove any air that may accumulate in the system B . take out unpleasant fumes from the refrigerant C . vent off excess refrigerant in an emergency D . permit opening the refrigerating system for cleaning and inspecting

A . main stem stop valve B . auxiliary steam stop valve C . feed check or control valve D . blow down valve

A . open and individual tank valves open B . open and the individual tank valves closed C . closed and the individual tank valves closed D . closed and the individual tank valves ope

A . open B . close C . remain in its position D . flood the evaporator with refrigerant

A . cam followers B . push rods C . combustion gases D . valve spring

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 . be jammed B . be opened C . be seated D . be broke

A . closing later B . opening sooner C . staying open for a shorter period of time D . staying open for a longer period of time

A . later and close sooner B . sooner and close later C . sooner and close sooner D . later and close later

A . cam action B . spring force C . fuel oil pressure D . firing pressure

A . tightened up B . sealed up C . opened up D . unscrewed

A . return to a neutral position B . flood the evaporator C . open D . close

A . maximum power at a normal load B . maximum power and load under normal conditions C . half speed and normal temperature D . normal operating temperature without a load

A . after TDC B . before TDC C . after BDC D . before BDC

A . always be wide open when the compressor restarts B . continue to operate as if the system were in operation C . remain open until evaporator pressure equalizes, then close until the compressor restarts D . always be completely closed until the compressor restart

A . to open B . opening C . open D . opened

A . gate valve B . globe valve C . check valve D . plug cock

A.always be wide open when the compressor restarts B.continue to operate as if the system were in operation C.remain open until evaporator pressure equalizes, then close until the compressor restarts D.always be completely closed until the compressor restarts