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【单选题】
对于输入语句scanf('%f，%f'，&a，&b);要使变量a、b上的值分别为 1.78和2.48，则正确的输入是( )A.
1.78，2.48后跟回车
B.
1.78 2.48后跟回车
C.
1.782.48后跟回车
D.
1.78;2.48后跟回车
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