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【单选题】
关于喷油器启阀压力的正确叙述是（）。A.
启阀压力等于针阀落座的燃油压力
B.
启阀压力等于启阀弹簧预紧力
C.
启阀压力高于针阀落座时的燃油压力
D.
启阀压力等于针阀落时油压，但大于启阀弹簧预紧力
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举一反三
【简答题】Many companies use post and electronic __________ because they can target a particular group of consumers all at the same time.
【单选题】The consumers all complain___the poor quality of the detergent.
A.
with
B.
on
C.
about
D.
of
【简答题】宋代出现了( )的趋势,并为国人普遍接受与使用,这是我国家具史上的一次重要转折。
【单选题】The consumers all complain ____ the poor quality of the detergent.
A.
with
B.
on
C.
about
D.
for
【单选题】( )(73)The consumers all complain_____the poor quality of the detergent.
A.
with
B.
on
C.
about
D.
for
【单选题】The consumers all complain______the poor quality of the detergent.
A.
about
B.
with
C.
to
D.
on
【单选题】Many companies use post and electronic __________ because they can target a particular group of consumers all at the same time.
A.
slogans
B.
mailshots
C.
posters
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