单项选择题

Bleeding from a vein is（）.

A.dark red and has a steady flow
B.bright red and slow
C.bright red and spurting
D.dark red and spurting

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单项选择题

Basic emergency care for third degree electrical burn is to（）.

A.flood the burned area with warm water for two minutes
B.brush away the charred skin and wrap the burned area
C.cover the burned area with a clean cloth and transport the patient to a medical facility
D.apply ointment or spray to the burned area and wrap with a clean cloth

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Atmospheres laden with coal dust or grain dust caused by loading these cargoes（）.

A.require loading operations to be shut down until the atmosphere clears
B.are toxic to human life
C.are subject to spontaneous combustion
D.may be explosive in some concentrations

单项选择题

Antiseptics are used principally to（）.

A.speed healing
B.prevent infection
C.reduce inflammation
D.increase blood circulation