单选题If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.Aa little lowerBa little higherCtoo lowDexactly the same
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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