正确答案: D

A，B，C均对

题目：废气锅炉允许的废气压力损失，对废气流速有重大影响，因为（）。

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学习资料的答案和解析：

[单选题]All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.

the running-in period

[单选题]Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

engine

[单选题]The complete assembly of bedplate, A-frames and cylinder block is held together by （） to form a rigid structure.

tie rods

[单选题]If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.

compression pressures are below normal