正确答案: D

chromium-plated

题目：In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.

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学习资料的答案和解析：

[单选题]Main bearings are required to support the crankshaft at each （）.

journal

[单选题]The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.

opened

[单选题]A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.

to the expansion tank

[单选题]Auxiliary boilers are divided into several classifications, one of which is （）.

water-tube forced circulation