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当前学科：燃气轮机机电运行工（高级）
题目：
单选
如果凸轮轴位置和正时偏离（）度以上，气门就会和活塞接触，这样会造成必须进行修理的发动机损伤。
A . 20
B . 30
C . 18
D . 40
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