物质C6H5 -CH2 Cl的命名中,正确的有()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
阅读程序,说明程序执行后BH,BL,AL,CL的值;
MOV BL, 72H
MOV AL, BL
MOV CL, 4
SHR BL, CL
OR BL, 30H
MOV BH, BL
AND AL, OFH
OR AL, 30H
MOV BL, AL
INT 3
BH=(),BL=(),AL=(),CL=()
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