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当前学科:汽车驾驶员高级工考试
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柴油机启动时,排气管不冒烟。拧紧喷油泵的放气螺钉,用手油泵泵油,放气螺钉处无油流出,且手油泵活塞杆上提时感到阻力较大,说明()。
A . A、油箱主输油泵油路堵塞
B . B、柴油滤清器堵塞
C . C、输油泵进油阀失效
D . D、输油泵出油阀失效
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