6250型船用柴油机气缸套最大内径增量为1.5mm，则最大缸径为（）

【名词&注释】

螺旋桨(propeller)、耐磨性(wear resistance)、绝缘性(insulating)、柴油机气缸套(engine cylinder liner)、用柴油机、符合要求(meet the requirement)

[单选题]6250型船用柴油机气缸套最大内径增量为1.5mm，则最大缸径为（）。

A. 251.5mm
B. 51.5mm
C. 626.5mm
D. 63.5mm

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学习资料：

[单选题]船舶轴系是从（）起至（）止。

A. 曲轴尾法兰/艉轴
B. 曲轴尾法兰/螺旋桨
C. 推力轴尾法兰/艉轴
D. 推力轴尾法兰/螺旋桨

[单选题]衡量轴系同轴度实测值δ总、φ总的标准，下列（）的说法不正确。

A. 标准δ总δ总max、φ总max构成δ总max-φ总max三角形
B. δ总max、φ总max在三角形内的符合要求^{(meet the requirement)}
C. δ总max、φ总max在三角形外的则超差
D. 当δ总max＜φ总max，φ总＜φ总max时符合要求^{(meet the requirement)}

[单选题]桦木层压胶木是铁梨木的代用材料，具有材质致密、坚硬、耐热、绝缘性好、成材率高，缺点是（）。Ⅰ.耐磨性差；Ⅱ.耐蚀性差；Ⅲ.耐水浸性差；Ⅳ.刚性差；Ⅴ.脆性大。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅴ
C. Ⅱ＋Ⅴ
D. Ⅱ＋Ⅳ

[单选题]As a heat engine,（） energy is the source of power by which the diesel engine can be operated.

A. electric
B. heat
C. mechanical
D. exhaust

[单选题]On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.

A. the camshaft
B. the flange
C. the ridge
D. the bulge

[单选题]The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.

A. operating the boiler at less than normal water level
B. installing fins on the firesides of water-tubes
C. increasing the amount of excess air to the burners
D. treating the boiler water with chemical oxygen scavenger

[单选题]Poor combustion in a diesel engine can be caused by （）.

A. high compression pressure
B. low intake air temperature
C. low exhaust pressure
D. high scavenge air pressure

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