[单选题]A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).

正确答案 ：A

reduce heat radiation to the engine room

解析：解析：water jacket：水套;exhaust manifold：排气总管;heat radiation：热辐射;condense and drain moisture from exhaust gases:将水分从排气中冷凝析出;dampen exhaust gas pulsations in the manifold：缓解排气总管中的废气脉动

[单选题]“瞭望”的目的是：

正确答案 ：A

对当时的局面及碰撞危险作出充分的估计

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