【单选题】【消耗次数：1】
松开喷油泵联轴器的连接螺栓，按喷油泵凸轮轴旋转方向转动凸轮轴，可以使供油提前角
①
加大
②
减小
③
不变
④
以上都不正确
参考答案：
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Declaration
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complains
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in great spirit
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every
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