单选题
1分
Changes in direction or speed of the main propulsion units shall be recorded, ____ an Administration...
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.
参考答案: D
参考解析: 主推进动力装置的变向和变速应做记录,除非主管机关认为该船的特性和大小做这样的记录行不通。