有关Ports正确的是（）

[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 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

[单选题]As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.A . being compressedB . to be pumped upC . is pressurizedD . are built u

[单选题]We ________ many European ports every yearA．call atB．call forC．call onD．call in

[单选题]All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.A . angledB . roundedC . being angledD . being rounded

[判断题]Through Bills of Lading cover from or to ports involving transport by two o

[单选题]（ ） could reduce congestion in ports， significantly shortens shipping time

[单选题]（ ） could reduce congestion in ports， significantly shortens shipping time