The use of sinking and dispersing chemical agents for removal of surface oil is ______.A.the most common method used in the United StatesB.too expensive for common useC.generally safe to sea lifeD.authorized only with prior approval of the Federal On-Scen

题目

The use of sinking and dispersing chemical agents for removal of surface oil is ______.

A.the most common method used in the United States

B.too expensive for common use

C.generally safe to sea life

D.authorized only with prior approval of the Federal On-Scene Coordinator

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Oil is carried in （）.A、tanksB、tankersC、chemical carriersD、holds

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第2题

单选题One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.A it can break down under high heat and emit noxious fumesB it will decompose under prolonged storage and lose its effectivenessC fire has been known to flash back over the surface of an oil fireD it is ineffective in fighting fires in high-voltage electrical equipment

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第3题

单选题A (n) （） is a chemical or electro-chemical attack on the metal surface which may be further increased if the sea-water is polluted.A erosionB corrosionC cavityD scouring

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第4题

单选题In cleaning up an oil spill, the use of straw or reclaimed paper fibers would be an example of which type of oil removal?（）A Chemical agent removalB Mechanical removalC Absorbent removalD None of the above

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第5题

问答题Chemistry is the study of the behavior and composition of matter. All foodsare made up of chemical substance which undergoes chemical changes when cooking 　 1．_______in an oven or digested within the body. The cooking of meat and vegetables induce　2．_______chemical changes, making it more delicious; similarly the leavening action of　　　3．_______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion.　　Cookery is a science requiring for a knowledge of chemistry.　　　　　　　　　 4．_______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, scream-ing agents, preservatives, etc. Each is carefully prepared before painstaking　　　5．_______research.　　It is therefore essential for trained cookers to understand　　　　　　　　　　6．_______chemical science in order to appreciate the chemistry nature of foods　　　　　　 7．_______and the changes achieving on cooking. Homeworkers should also　　　　　　　　　　 8．_______know cleansing agents and textiles used in the home and how the latter　　　　　　 9．_______responds to the effects of heat, light, water, and chemical cleansing agents.　　 10．_______

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第6题

单选题What is an advantage of using foam in fire fighting?（）A It is effective in controlling fire in flowing oil such as coming from a broken fuel lineB It absorbs heat from materials that could cause reignitionC Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishmentD Once the surface is blanketed with foam and the fire is extinguished，no further foam is required

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第7题

单选题The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.A contaminating waterB contaminated additivesC contaminated fuelD contaminating impurities

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The use of sinking and dispersing chemical agents for removal of surface oil is ______.A.t

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