单项选择题

Corrosive liquids and acids should have which kind of label?（）

A.Skull and crossbones
B.Yellow and white
C.Red and white
D.White and black

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单项选择题

A.soft clay
B.hard mud
C.very soft mud
D.sand

单项选择题

A.immediately after restoring vital services
B.immediately
C.following control of flooding
D.following establishment of fire boundaries

单项选择题

A.prevailing westerlies
B.horse latitudes
C.trade winds
D.subpolar low pressure belts