单项选择题
A.1 B.3 C.4 D.9
A.2+4>8 B.3+12=15 C.5>0 And 4>3 D.10/5<3
A.8ad B.ad C._ad D.const
A.A=B;B=C;C=A B.C=A;A=B;B=C C.A=B;B=A D.C=A;B=A;B=C
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