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职称英语《综合类》补全短文练习题 Avalanche andIts Safety An avalancheis asudden andrapid flowof snow,often mixedwith airand water,down amountainside.Avalanches are1the biggestdangers inthe mountainsfor bothlife andproperty. All avalanchesare causedby anover=burden of___terial,typically snowpack,that istoo___ssive andunstable forthe slope2supports it.Determining the critical load,the amountof over-burden whichis3to causean avalanche,4a plextask involvingthe evaluationof anumber offactors. Terrain slopesflatter than25degrees orsteeper than60degrees typicallyhave alow5of avalanche.Snow doesnot6significantly onsteep slopes;also,snow doesnot7easily onfiat slopes.Hu___n-triggered avalancheshave thegreatest incidencewhen thesnows angleof rest1is835and45degrees;thecriticalangle,the angleat whichthe hu___n incidenceof avalanchesis greatest,is38degrees.The ruleof thumb2is:A slopethat is9enough tohold snowbut steepenough to...。