搜索 - 科创网

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内容：但有关人士认为，无辫电车大规模推广尚需时日，一方面，车辆制造和与之配套的充电站建造尚需时日；另一方面，该车身价太高，单价在80万元左右，而普通空调电车仅40万元，公交企业担忧购车成本过高。

内容：地表常见的水合肼制备方式有如下几种：1'拉西法：用过量氢氧化钠溶液和氨水在加压环境下约450K合成，完成反应仅需数秒并且产率高，但是涉及高压加热，业余条件制造耐压容器不现实，购买又十分昂贵，故不采用。,以次氯酸钠为氧化剂，尿素为氨源，在硫酸镁的存在下，尿素液与次氯酸钠和烧碱混合液反应得到质量分数大约为0.05的粗肼，无需高压，唯一的缺点是副产盐较多，蒸馏分离耗能较大，不过对于业余制备而言，蒸馏分离的难度远低于制造

内容：说到电动机（包括教科书及市面上常见的各类电机），即使采用普通材料制造、常温工作，只要转速足够高(自身机械特性的下限），体积足够大（常规材料下一般要10千瓦以上），效率都能达到90%以上，造得好的能达到95%,说说结论吧，导轨、线圈、感应、重接、磁阻等各种电磁发射装置在制造中，做得好，都能达到很高的效率，理论上甚至是80%以上，只不过普通爱好者受限于种种条件制约，很难做好而已。

约找到 3478 条结果，耗时 0.343 秒

文章分类：

注意事项：

当前账号的附件下载数量限制如下：