[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 up

B．closed off

C．lined up

D．taken off

参考答案与解析：

相关试题

As the plunger moves up, the ports are c

[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

  • 查看答案

    • (ii) Upwards; (3 marks)

    [试题](ii) Upwards; (3 marks)

  • 查看答案

    • The plunger in a jerk pump is rotated un

    [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

  • 查看答案

    • The plunger in the fuel injector pump, u

    [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

  • 查看答案

    • The earth moves [around]the sun.

    [单选题]The earth moves [around]the sun.A.beforeB. roundC. afterD. over

  • 查看答案

    • The piston moves up and down, thus causi

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

  • 查看答案

    • Louis-Barr综合征

    [名词解释] Louis-Barr综合征

  • 查看答案

    • My father often works( )into the night，which moves me( ).

    [单选题]My father often works( )into the night，which moves me( ).A.deeply，deelyB.de

  • 查看答案

    • My father often works( )into the night，which moves me( ).

    [单选题]My father often works( )into the night，which moves me( ).A.deeply，deelyB.de

  • 查看答案

    • My father often works( )into the night，which moves me( ).

    [单选题]My father often works( )into the night，which moves me( ).A.deeply，deelyB.de

  • 查看答案