As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.

[单选题]A．s the plunger moves upwards in the barrel, injection will commence once the plunger bas_______the spill ports and the pressure builds up.A．opened upB．closed offC．lined upD．taken off

[单选题]The piston moves up and down, thus causing the rotational movement of the（）A . crankshaftB . connecting rodC . cross-headD . main beating

[单选题]The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.A . the scavenging airB . the exhaust gasesC . the mixed airD . the spray oil

[单选题]The plunger in a jerk pump is rotated until the release port is uncovered If the port remains uncovered all of the time, which of the listed operations will occur?A．No fuel will be deliveredB．The maximum effective stroke will be attainedC．The fuel de

[单选题]The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.A . crankshaftB . camshaftC . piston rodD . rack and pinio

[单选题]The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.A . so a heightB . such a heightC . so highD . such high

[单选题]The author mentions the ports of Los Angeles and Long Beach to ______.［A］prove they are the largest ports in the United States［B］demonstrate they create many new job opportunities［C］highlight that shipping is less glamorous than making movies［D］empha

[单选题]Directional intake ports in diesel engines are used to （）.A . reduce air charge turbulenceB . induce air swirlC . deflect hot combustion gas away from the valvesD . oppose the effects of piston induced squish

[多选题] 有关Ports正确的是（）A . 是套接字的一部分B . 可以设置的范围为1～1024C . HTTP服务的端口号为80D . 是协议设置好的，不能认为改动

[单选题][A/] embarrassing/[B/] inspiring/[C/] upgrading/[D/] innovating