If a cam-controlled engine has a normal injection pressure at rated speed the injection p

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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

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗