In a central cooling system, used in some modem ships, sea w

【名词&注释】

适应性(adaptability)、约束条件(constraint condition)、机动性(mobility)、快速性(rapidity)、多功能性(versatility)、灵敏性(sensitivity)

[单选题]In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.

A. main bearings
B. sea water
C. cooling oil
D. lower temperature fresh water

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学习资料：

[单选题]船舶的机动性是指（）。

A. 船舶的快速性
B. 船舶的多功能性^{(versatility)}
C. 改变船舶状态的灵敏性^{(sensitivity)}
D. 对不同航区的适应性

[单选题]阀杆直径大于20mm时，允许有长度不大于（）mm的发纹，但在纵向同一位置上下不得有多于（）处的发纹。

A. 10/2
B. 20/2
C. 10/3
D. 20/3

[单选题]根据轴系的结构特点，以轴承负荷、轴段内的应力、弯矩、转角等为约束条件，通过优化计算，确定轴承的合理位置，热态下使各轴承的负荷在允许值内且合理分布，轴段内的应力、弯矩、转角也均在允许值内。这一过程称为（）。

A. 直线校中
B. 按轴承允许负荷校中
C. 合理校中
D. 轴系校中

[单选题]The indicated power of an engine can be obtained by taking the （）.

A. precautions
B. rpm
C. indicator cards
D. B and C

[单选题]In the combustion chamber, the part whose surface is exposed to the highest temperature is the （）.

A. cylinder liner
B. cylinder cover
C. piston
D. exhaust valve

[单选题]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.

A. ensure penetration and distribution of the fuel in the combustion chamber
B. ensure the needle valve is flushed clean during each injection
C. prevent combustion gas blowback into the open needle valve
D. prevent reflected pressure waves when the needle valve close

[单选题]The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.

A. causes colloid suspension in the cooling water
B. reduces the capability of the lubrication system
C. can form pockets which block the flow of coolant through the system
D. leads to the scuffing of cylinder wall

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