【名词&注释】
密封性(sealing)、使用性能(service performance)、喷油器(injector)
[单选题]燃油系统中的针阀偶件使用性能丧失可以采用( )去修复。
A. 局部更换
B. 成套更换
C. 尺寸选配法
D. 成套更换或尺寸选配法
查看答案&解析
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举一反三：
[单选题]They should ________ taken great care of.
A. been
B. being
C. be
D. is
[单选题]喷油器针阀座因磨损而下沉时对喷油器工作的影响是( )。
A. 雾化不良
B. 针阀升程变小
C. 密封面压力增大
D. 密封性变好
[单选题]The three basic components of a fire are chain reaction, heat, fuel, and ____.
A. carbon monoxide
B. oxygen
C. carbon dioxide
D. any gaseous substance
[单选题]When the refrigeration demand is small,_______.
A. the expansion valve will move toward the wide open position
B. the expansion valve will move toward the closing position
C. the feeler bulb will conveys the high temperature
D. the superheat degree will raise
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