楼主: 不爱吱声
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[科普知识] [趣味力学] 空腔聚能与金属射流(一),(二) |
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点评
成本效益!太阳能发电能量转换率低,成本高一度一块(或者最低0.6元RMB左右),水利发电,低的据说是几分钱。
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