A、 2
B、 -2
C、 1/2
D、 -1/2
答案:D
A、 2
B、 -2
C、 1/2
D、 -1/2
答案:D
A. μ愈大
B. μ愈小
C. σ愈大
D. σ愈小
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B. INCLUDEPICTURE \d "https://p.ananas.chaoxing.com/star3/origin/e498cc472af36f04e2161c2ca81d0969.png" \* MERGEFORMATINET
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