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【单选题】
以下程序段执行后结果为( ) {int a=58,m; switch(s/10) {case 0: case 1: case 2: case 3: case 4: case 5: m=1; case 6: m=3; case 7: m=5;break; case 8: m=6;break; case 9: m=7;break; default:m=0;} printf(“m=%d\n”,m);}A.
m=1
B.
m=5
C.
m=3
D.
m=0
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【单选题】设非齐次线性方程组AX = B中未知量个数为n, 方程个数为m, 系数矩阵A的秩为r,则 ( ) .
A.
r = m时,方程组AX = B有解
B.
r = n时,方程组AX = B有唯一解
C.
m = n时,方程组AX = B有唯一解
D.
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