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The second level sits roughly flush with the top of the controller die, providing four electrical contacts on one side and two on the other that are connected to the six pins of the controller by gold ball bonds. I didn’t measure connectivity from these pads to package pins or the crystal, but based on the general floorplan of the device my educated guess is that the four corner pins connect to the package pins, while the two center pins connect to the quartz crystal (sitting above the controller on the third level).,这一点在谷歌中也有详细论述
15年前,日本福岛核电站在强烈地震和海啸冲击下发生严重核泄漏,举世震惊。福岛核事故看似天灾,实为人祸,暴露出日本核监管体系长期存在严重漏洞,核安全文化严重缺失,给日本带来惨重深刻的教训。福岛核事故中断了全球核能发展势头,沉重打击国际社会对核安全的信心,许多国家被迫重新审视核能发展政策和规划,不得不付出更多时间、更高成本重新拥抱核能。