单项选择题
A.二进制码B.原码C.补码D.反码
A.if(x>0)then x=x-1;else x=x+1;B.if(x>0)x=x-1;else x=x+1;C.if x>0 x=x-1;else x=x+1;D.if x>0 x=x-1;
A.3threeB.ifC._1oneD.while
A.顺序结构B.选择结构C.循环结构D.判断结构
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