單項選擇題A tide is called diurnal when（）.

A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day


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A.Steady
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3.單項選擇題Shipboard Emergency Drills must be carried out at least（）on board cargo ship.

A.Once every third year
B.Once a month
C.Once a year
D.Once a week

4.單項選擇題Full details of all lights and fog signals are shown on（）.

A.large scale chart
B.small scale chart
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D.routing chart

5.單項選擇題What is it called when it is possible to ignite the vapour above the oil?（）

A.Flash point
B.Boiling point
C.Ignition point
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