正确答案: A

专用量具

题目：舵系中心线与轴系中心线位置度检验方法采用（）。

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学习资料的答案和解析：

[单选题]MAN B&W MC型柴油机在约定MCR工况下，允许增压器后排气背压为（）MPa，废气管内实际流速约为（）m/s

0.003/35

[单选题]对于质量分布在同一平面内，轴向长度较小的回转件，其平衡精度用（）表示。

B．e

[单选题]油润滑艉轴承和艉轴在（）式润滑系统中工作，艉轴（）。

闭/不包铜套

[单选题]During the suction stroke, the piston is moving （）.

downwards

[单选题]Exhaust temperature increases in all cylinders, the possible cause may be（）(1) increased scavenging air temperature(2) air in fuel pumps and fuel valves(3) fouling of air and gas passages

(1)+(3)

[单选题]The mechanical efficiency of an engine （） because losses occur in the form of friction.

is always less than 100%

[单选题]To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of （）.

monel metal or stainless steel