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【单选题】
某字长为 8位的计算机中，已知整型变量 x、y的机器数分别为[x]补=1 1110100，[y]补=1 0110000。若整型变量 z=2*x+y/2，则 z的机器数为A.
0010 0100
B.
1010 1010
C.
溢出
D.
1100 0000
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