單項選擇題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

3.單項選擇題When two power-driven vessels are meeting head-on and there is a risk of collision,each shall().

A.stop her engines
B.alter course to starboard
C.sound the danger signal
D.back down

4.單項選擇題The overall set in Malacca straight is to the NW, but from May to September there is a tendency for SE sets to prevail in some N and central parts.In this sentence,“set”refers to().

A.The direction of traffic flow
B.The direction of current
C.The direction of monsoon
D.The direction of wind