- 问题详情:下图为某人工鱼塘食物网及其能量传递示意图(图中数字为能量数值,单位是J.m-2.a-1)。下列叙述正确的是 A.该食物网中最高营养级为第六营养级B.该食物网中第一到第二营养级的能量传递效率为25%C.太阳鱼呼吸作用消耗的能量为1357J.m-2.a-1D. 该食物网中的生物与无机环境...
- 16190
- TheArtCharacteristicsandSouthAfricainCoetzeesFictionOnJ.M.CoetzeesDisgrace;J.MorJ.D.?:ComparisonofQuality-compositeLegalPersonnelEducationinChina,JapanandU.S.A.;J.M.:I'mfromthestateofFloridainAmerica.I'vebeeninChinaforabout2years.J.M.:Well,you'vem...
- 25162
- AsoftwarereliabilitymodelforsubstationautomationsystembasedonimprovedJMmodelissetupinthispaper.JM系列胶体磨为湿式物料微细加工机械。JMmixedflowpumpsareruggedlydesignedforyearsoftroublefreeoperationinawidevarietyofapplications.JM:从我们的例子开始并订阅...
- 22025