正确答案: A

water discharges from the indicator cocks

题目：It is abnormal that when the engine is being turned by the turning gear or by hand, （）.

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学习资料的答案和解析：

[单选题]（）对发动机加速性影响更为突出，因此（）为优。

受热部件的热惯性/中速机

[单选题]若已知曲轴的轴线状态呈拱腰形，则其两主轴承高度必然（）于相邻轴承，测得臂距差为（）值。

高/负

[单选题]导致曲轴轴线产生塌腰形变形，臂距差朝正值增大方向变化的因素有（）。Ⅰ.爆发压力；Ⅱ.飞轮重量；Ⅲ.曲轴自重；Ⅳ.活塞装置重量；Ⅴ.轴系轴线低于曲轴轴线，两法兰呈上开口。

A．Ⅰ＋Ⅲ＋Ⅳ

[单选题]填料函式密封装置具有（）等优点。Ⅰ.结构简单；Ⅱ.价格低廉；Ⅲ.工作较可靠；Ⅳ.维护管理方便；Ⅴ.易于检修。

Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

[单选题]In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

downwards；upwards

[单选题]The main purpose of the piston oil scraper rings is to （）.

reduce the amount of lube oil burned in the combustion chamber