单项选择题 Changes in direction or speed of the main propulsion units shall be recorded, （）an Administration has determined that the size or characteristics of a particular ship make such recording impracticable.

单项选择题 The officer in charge of the engineering （）the watch to the reliving officer if there is reason to believe that the latter is obviously not capable of carrying out the watch-keeping duties effectively.

单项选择题 The officer in charge of the engineering watch shall continue to be responsible for machinery operations, （）the presence of the chief engineer in the machinery space.