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[单选题]
已知字符串s='a1b2c3',则以下表达式的值为'123'的是()
A.s[1::2]
B.s[::2]
C.s[-1::2]
D.s[-5:-1:2]
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A.s[1::2]
B.s[::2]
C.s[-1::2]
D.s[-5:-1:2]
第9题
(A)s1=s2
(B)s1==s2
(C)strcpy(s1,s2)==0
(D)strcmp(s1,s2)==0
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