正确答案: D

lower temperature fresh water

题目：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.

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学习资料的答案和解析：

[单选题]船舶的机动性是指（）。

改变船舶状态的灵敏性

[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。

20/2

[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（）。

合理校中

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

B and C

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

piston

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

ensure penetration and distribution of the fuel in the combustion chamber

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

leads to the scuffing of cylinder wall