正确答案: D

t2降低，能够回收的排气余热过多

题目：废气锅炉出口排烟温度t2不待低于160—170℃，不正确的原因是（）。

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学习资料的答案和解析：

[单选题]防止拉缸的工艺措施主要是（）。Ⅰ.保证活塞运动装置的安装精度；Ⅱ.保证活塞运动装置的对中性；Ⅲ.采用波纹加工；Ⅳ.采用精车加工；Ⅴ.采用研磨加工。

D．Ⅰ＋Ⅱ＋Ⅲ

[单选题]High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.

many thousand times

[单选题]The work fuel does in each working cycle can be obtained by taking the （）.

indicator cards

[单选题]In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.

straight reciprocation