A design method for light-emitting diode(LED) array is proposed to achieve a good uniform illumination distribution on t......

Classroom instructions Task 1 In teaching English to beginning children,would you insist on yourself using more Eng-lish......

分析了光卤石浮选过程中生产1 t氯化钾的原矿消耗、水消耗、矿浆体积、母液量,以及氯化钾收率等与母液中氯化镁含量的关系,得出了......