今天不知道某厂商3个9能不能保住

kaolj

99.9 = 8760 * 0.1% = 8760 * 0.001 = 8.76小时

99.99 = 8760 * 0.0001 = 0.876小时 = 0.876 * 60 = 52.6分钟

99.999 = 8760 * 0.00001 = 0.0876小时 = 0.0876 * 60 = 5.26分钟

99.9999 = 8760 * 0.000001 = 0.00876小时 = 0.00876 * 60 = 0.5256分钟