正确答案: D

ridging

题目：Each journal and pin should be examined for （） and grooving.

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学习资料的答案和解析：

[单选题]柱塞偶件配合面磨损后会导致（）。Ⅰ.喷油压力下降；Ⅱ.喷油定时延后；Ⅲ.喷油量减少；Ⅳ.喷油时间延长。

D．I＋Ⅲ

[单选题]The fine filters will be arranged （） one can be cleaned while the other is operating.

so that

[单选题]The space between cylinder liner and jacket is called （）.

the cooling water space