正确答案: C

C．＜4.5

题目：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。

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学习资料的答案和解析：

[单选题]活塞运动部件失中是指（）。

活塞运动部件与固定件相互位置异常

[单选题]水润滑艉轴铜套接缝处渗漏海水可引起艉轴发生（）。

电化学腐蚀

[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。

Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

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

is running

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

slightly less than atmospheric pressure

[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 （）.

furnace to be re-purged

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

Main bearings

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

Run it at half speed for a period of time