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metro <- subset(train, area__rucc == c("Metro - Counties in metro areas of 1 million population-接下来,我尝试用非地铁级别来划分,像这样的.
not_metro <- subset(train, area__rucc !, "Metro - Counties in metro areas
我尝试过使用Windows和exFAT进行格式化(这是explorer.exe上仅有的两个选项,我现在正在尝试其他选项),但仍然没有显示出来[212261.611033] usb 2-, idVendor=0781, idProduct=558c, bcdDevice=10.12[212261.637620] usb 2-4: Product: Extrem