total := a + b + c; // OK — same operator throughout
However, whereas PCs typically have a rechargeable battery or removable coin cell that is used to retain configuration settings and maintain the time-of-day while powered down, Sun hardware instead uses a TIMEKEEPER device which integrates SRAM, RTC and a battery. Hence when the battery fails, the entire device must be replaced.,更多细节参见新收录的资料
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