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【单选题】
x=[-1 4.1 5.2 3.6 -8 -2.4 -1];find(x<0) 运行的结果为A.
1 0 0 0 1 1 1
B.
-1 -8 -2.4 -1
C.
[1 1;1 5;1 6;1 7]
D.
1 5 6 7
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