單項(xiàng)選擇題Which instrument is used to measure the relative humidity of air?（）
A.Hydrometer
B.Hygrometer
C.Spectrometer
D.Barometer
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1.單項(xiàng)選擇題（）is normally responsible for maintaining records of corrections to navigational charts and nautical publications.
A.The chief officer
B.The second officer
C.The third officer
D.The PSC officer
2.單項(xiàng)選擇題The company should establish procedures by which（）receive relevant information on the safety management system in working language or language understood by them.
A.New personnel
B.The ship's personnel
C.Personnel transferred to new assignments
D.Visitor
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