已知直角三角形两直角边长为 a , b, 求斜边长 c 的一个 算法分下列三步 : 1计算 c= 2输入直角三角形两直角边长 a, b 的值 ; 3输出斜边长 c 的值 . 其中正确的顺序是 ( )
A.
①②③
B.
②③①
C.
①③②
D.
②①③
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