if(pir_flag == PIR_FLAG)这句话是什么意思啊!

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if(pir_flag == PIR_FLAG)这句话是什么意思啊! =IF(IF(D6 excel中,函数=if(if-0.03 if函数计算分段=IF(M11 =IF(B8>0,IF(AND(B8 公式=IF(A1 =IF(C2 =IF(1 EXCEL =IF(C2 =ROUND(IF(J5 =IF(E2 =IF(C2 =if（E2 =IF(A1 =IF(D6 =IF(A1 =IF(RAND() if(a=