单项选择题
A.2+5=7 B.a+b=7 C.a+b=a+b D.7
A.x<10andy>0 B.x<10：y>0 C.x<10ory>0 D.x<10，y>0
A.9 B.6 C.5 D.10
A.const N as integer B.Dim N as integer C.Dim N as single D.const N as single
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