1. [单选题]A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).
A. reduce heat radiation to the engine room
B. aid in preventing turbocharger overheating
C. condense and drain moisture from exhaust gases
D. dampen exhaust gas pulsations in the manifold
2. [单选题]“瞭望”的目的是：
A. 对当时的局面及碰撞危险作出充分的估计
B. 及早发现来船，并对其是否与本船构成碰撞危险作出系统的分析
C. 避免紧迫局面
D. 避免紧迫危险
