北师大版七年级下册数学期末试卷及答案

北师大版七年级下册数学期末试卷及答案

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时间:2018-08-07

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2、anningandcontrolwater(a)plans,andtheirimplementation.A,yearb,quartersc,3,coalmines,mineshouldbe(a)forwatereducationandtrainingtoensureemployeeshavethenecessaryknowledgeofwatercontrol,improvingwatercontrolworkskillsandtheabilitytoresistwaterdamage.A,b,c,grass-rootsleaders,leadersofw

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4、droadwayintothewellbore,overandabovethepumpHousefloor7m.A,1b,2c,3d,46miningareawaterChamber,theeffectivecapacityshouldbeabletohold(b)normalinflowinminingarea.A,2Hb,4Hc,6hd,8h7,shortsumpcapacityshouldbemaintainedatatotalcapacityof(b)above.A,40%b,50%c,60%d,70%8,intheyearbeforetherain

5、yseason,shouldcompleteoverhaul(a),andallpumpsandbackuppumpswere1jointtestsandfoundtheproblemanddealwithit.A,1b,2c,3d,4-9,complexandverycomplexhydrogeologicalconditionsofmineonthegroundcouldnotbeidentifiedwhenminehydrogeologicalconditionandwaterfillingfactorsshouldbepersisted,(d)the

6、principleofstrengtheningtheworkofsurveywater.A,diggingafterthefirstb,cmining,afterthefirsthadthesuspectswillfindd,excavationswillbe10,penetratingexplorationofgoafwater,karsticwateranddrillingwater,waterdrillinggrouplayout,andintheroadwayinfrontofthehorizontalplaneandverticalplanefa

7、n-shaped.Drillholelocationstomeethorizontaldistance(d)asthestandard,thickcoalseamintheboreholeoffsetmustnotexceed1.5M.A,1Mb,1.5Mc,2md,3M11,seam,prohibitioninprinciplesurveywaterpressureabove(c)MPawaterfillingfaultwater,aquiferwaterandkarsticwater.Ifneeded,youcanwaterproofwallandgat

8、ewallwithinsurveywater.A,b

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