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单选题
If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.
A
a little lower
B
a little higher
C
too low
D
exactly the same
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单选题If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）A
too lowB
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单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.A
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supply pressure to the pumpD
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low exhaust pressureC
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