软垢覆盖面积占牙面1/3以下时简化软垢指数记为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
已知AX=0BBCCH,CF=1,以下三条指令执行后,AX中内容是:() OR AX,3 CLC RCL AX,1
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