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问题 单项选择题

减压环带与密封锥面磨损综合后果是（）。

A.供油量增加，喷后滴油

B.各缸供油不均匀和喷油延续角拖长

C.使柴油机工作粗暴，冒黑烟，功率不足

D.以上都是

答案

参考答案：D

多项选择题

Nor lose possession of that fair thou ow’st;
Nor shall death brag thou wander’st in his shade,
When in eternal lines to time thou grow’st:
So long as men can breathe, or eyes can see,
So long lives this, and this gives life to thee.
Questions:

A. Where does the poem come from Who wrote it
B. What does "lines" mean
C. Interpret the poem briefly.
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填空题

横波斜入射到异质界面，使纵波反射角为90时的横波入射角称为（），它的大小只与第一介质的（）和（）有关。
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