题目内容

两样本比较的秩和检验若无效假设H0成立，则表示（）

A. 两个样本来自分布相同的两个总体
B. 两个样本均数相同
C. 两个样本来自均数相同的两个总体
D. 两个总体均数相同
E. 两个总体来自分布相同的个体

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Which of the following statements is mot correct about mirroring?（）

A. Mirroring, with the write-verify option turned on, can be used to increase performance.
B. Mirroring is a better choice that disk-striping, for large sequential-access file system when one is looking for performance.
C. Mirroring, with a parallel-scheduling policy, may improve I/O read-operation performance.
D. Mirroring, with maximum inter-disk allocation policy, is used to enhance availability.

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