沿海及内河的船舶，其螺旋桨直径D（）m时，螺旋桨和艉轴允许采用

【名词&注释】

环氧树脂(epoxy resin)、电化学腐蚀(electrochemical corrosion)、价格低廉(low price)、螺旋桨直径(diameter of a propeller)、填料函式

[单选题]沿海及内河的船舶，其螺旋桨直径D（）m时，螺旋桨和艉轴允许采用有键环氧树脂连接。

A. A．＜1.5
B. B．＞1.5
C. C．＜4.5
D. D．＞4.5

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学习资料：

[单选题]活塞运动部件失中是指（）。

A. 零部件失效
B. 活塞运动部件与固定件相互位置异常
C. 活塞运动部件与固定件装配精度下降
D. 产生拉缸故障

[单选题]水润滑艉轴铜套接缝处渗漏海水可引起艉轴发生（）。

A. 电化学腐蚀
B. 化学腐蚀
C. 氧化磨损
D. 微动磨损

[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。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

[单选题]Valve gear knocks are more easily located while the engine （）.

A. is running
B. stops
C. is repaired
D. lacks of oil

[单选题]A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）

A. slightly less than atmospheric pressure
B. approximately equal to exhaust manifold pressure at all times
C. that is widely fluctuating constantly
D. decreasing as engine load increase

[单选题]After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the （）.

A. furnace to be re-purged
B. electric charge to buildup in the igniter
C. fuel pump to restart
D. dram level to stabilize

[单选题]In a diesel engine lube oil system, which of the following parts should be lubricated first?（）

A. Camshaft beatings
B. Main bearings
C. Piston crowns
D. Cylinder wall

[单选题]How should you warm up a diesel engine that has not been run for some time? （）

A. Run it at minimum speed for a period of time
B. Run it at half speed for a period of time
C. Bring it to top speed immediately
D. Inject ether into the air intake

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