单项选择题 Engine room fires have been started by neglected oil leaks dripping on to hot pipes or exhaust manifolds （） insulation has not been replaced after maintenance.

单项选择题 The officer in charge of the engineering watch shall ensure that at all times bridge orders relating to changes in （） of operation are immediately implemented.

单项选择题 The officer in charge of the engineering watch shall ensure that all machinery involved with the maneuvering of the ship can immediately be placed in the （） of operation when notified that the ship is in congested waters.