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1、工程数学.计算？（）A．B．C．D．答题：A.B.C.D.（已提交）参考答案：A问题解析：2.行列式？A．3B．4C．5D．6答题：A.B.C.D.（已提交）参考答案：B问题解析：3.利用行列式定义计算n阶行列式：=?()A．B．C．D．答题：A.B.C.D.（已提交）参考答案：C问题解析：4.用行列式的定义计算行列式中展开式，的系数。A．1,4B．1，-4C．-1，4D．-1，-4答题：A.B.C.D.（已提交）参考答案：B问题解析：5.计算行列式=？（）A．-8B．-7choosewaterfountains,water-savingprodu
2、ctsshouldbepurchased.Ascomparedtoopenv-Groovetypewatersupplysystem,sealednipplewatersystemcansavewater81.35%savingbeddingconsumption56.3%;sanitationanddrinkingwater,andavarietyofharmfulgasesconcentrationsdecline,increasedlayingrate13.79%,economicefficiencyimproved.ChickenCoopc
3、onstructionshouldpayattentiontoseveralproblems,chickendistributionnotes:arationalstructureofthehen-houselayout,canprovideagoodenvironmentforchicken,makingitsfullproductivepotential,sootherthaninunderstandingthephysiologicalcharacteristicsofthechickenitself,andmustbeproperlypla
4、nnedandconstructedsheds.1.sitestochooseawayfrompopulatedareas,trafficconvenient,awayfromtheroad2.Gaozaoterrain,alotofsunshine.Wintersunaspossible,summerwind,andnotaftertherainwater.Larger,leavingroomfordevelopment3.Abundantwaterresourcespollution-free,easytoaccess,sufficientpo
5、werisguaranteed4.Buildingstructure,theeconomy,savingmoney,andsavingenergy,itisfacinginaccordancewithlocalenvironmentalandphysiologicalcondition,lightingisgood,easytoventilation,easytooperate,soconducivetocoolinginthesummer,toinsulationinwintercold5.Layoutofpremisesshouldbereas
6、onable,dodistinguishbetweenproductionandnon-productionareasandnon-productionareasandwatersourcesareonachickenfarminthewind,netroadanddirtroadseparatinguncrossed,dungfarmislocatedintheC．-6D．-5答题：A.B.C.D.（已提交）参考答案：B问题解析：6.计算行列式=？（）A．130B．140C．150D．160答题：A.B.C.D.（已提交）参考答案：D问题解析：7
7、.四阶行列式的值等于（）A．B．C．D．答题：A.B.C.D.（已提交）参考答案：D问题解析：8.行列式=？（）A．B．C．D．答题：A.B.C.D.（已提交）参考答案：B问题解析：9.已知，则？A．6mB．-6mC．12mD．-12m答题：A.B.C.D.（已提交）choosewaterfountains,water-savingproductsshouldbepurchased.Ascomparedtoopenv-Groovetypewatersupplysystem,sealednipplewatersystemcansavewater81.
8、35%savingbeddingconsumption56.3%;sanitationanddrinkingwater,a
