单项选择题
A.Starting of a fire pump
B.Reporting to stations
C.Preparing for the duties described in the muster list
D.Checking of cargo handling equipment
单项选择题 Which instrument is used to measure the relative humidity of air?（）
单项选择题 （）is normally responsible for maintaining records of corrections to navigational charts and nautical publications.
单项选择题 The company should establish procedures by which（）receive relevant information on the safety management system in working language or language understood by them.