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商品評論: 風和日暖──台灣外省人與國家認同的轉變

風和日暖──台灣外省人與國家認同的轉變
日期: 2020 一月 20 週一
評論者: 訪客

評論:
I'm a trainee http://buy-levitra.in.net/ levitra 20 mg The new ytterbium clocks tick with even more stability than the NIST F-1, "stable to within less than two parts in 1 quintillion (1 followed by 18 zeros), roughly 10 times better than the previous best published results for other atomic clocks," the NIST said.


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