单项选择题

During which condition should the operator of a pedestal crane shutdown operations?（）

A.Bunkering
B.High winds
C.Potable water spill on deck

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单项选择题

During transfer operations，a quantity of propylamine spills on deck. According to the Chemical Data Guide，the correct procedure would be to（）.

A.immediately flush the spill with large quantities of fresh water
B.cover the contaminated surface with soda-ash-soaked lime solution
C.add sodium bisulfate on the contaminated surface and spray it down with water
D.move to a position upwind of the spill and allow the product to boil off

单项选择题

During the winter months，the southeast trade winds are（）.

A.stronger than during the summer months
B.weaker than during the summer months
C.drier than during the summer months
D.wetter than during the summer months

单项选择题

During the month of October the Sun’s declination is（）.

A.north and increasing
B.north and decreasing
C.south and increasing
D.south and decreasing