正确答案: A

downwards；upwards

题目：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.

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学习资料的答案和解析：

[单选题]船舶营运期间，（）对保证动力装置的可靠性有重要意义。人为故障比例增加就是证明。

A+B

[单选题]In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

through an inlet valve

[单选题]The crank chamber oil （）.

can be recovered

[单选题]The engine has one or two group of fuel pumps, depending upon （）.

the number of cylinders

[单选题]The main moving parts of a diesel engine consist of the （） and the pistons.

crankshaft, the connecting rods

[单选题]The process to remove exhaust gases by blowing in fresh air is called （）.

scavenging

[单选题]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

staying open for a shorter period of time

[单选题]A dirty diesel engine oil filter element can best be detected by （）.

the pressure drop across the filter