If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.<br>A:a little lower<br>B:a little higher<br>C:too low<br>D:exactly the same

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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