题目内容

在80C51单片机中,可变波特率的多机通信应采用()。

A. 方式0
B. 方式1
C. 方式2
D. 方式3

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层站招唤箱的安装,并列电梯高度偏差不大于()mm。

A. 1
B. 2
C. 4
D. 5

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

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.

钢丝绳绕过圆筒或滑轮的直径不得大于绳直径的18倍。

A. 正确
B. 错误

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