单项选择题
Which instrument is most useful in forecasting fog（）.
A.A barometer
B.An anemometer
C.A sling psychrometer
D.A pyrometer
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Which channel and mode should be used when initiating a distress alert transmission（）.
A.Channel 6 DSC
B.Channel 6 Radiotelephony
C.Channel 13 Radiotelephony and channel 16 DSC
D.Channel 70 DSC -
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Where the master has not disclosed to the suppliers of necessaries that under an existing time-charter the Charterer is liable for the particular disbursements in question，（）will be liable to such suppliers to that extent.
A.The master
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Where advance freight is agreed upon，payment does not depend on delivery and must be made （）the ship is lost and the cargo never delivered.
A.Unless
B.When
C.Because
D.Even though
