單項選擇題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


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1.單項選擇題Antiseptics are used principally to().

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

2.單項選擇題An unconscious person should NOT be().

A.placed in a position with the head lower than the body
B.given an inhalation stimulant
C.given something to drink
D.treated for injuries until conscious

3.單項選擇題An advantage of an ABC dry chemical over a carbon dioxide extinguisher is().

A.lack of toxicity
B.the multipurpose extinguishing ability
C.burn-back protection
D.cooling ability

5.單項選擇題After an accident the victim may go into shock and die. What should be done to help prevent shock?()

A.Slightly elevate the head and feet
B.Keep the person awake
C.Keep the person lying down and at a comfortable temperature
D.Give the person a stimulant to increase blood flow