层站招唤箱的安装，并列电梯高度偏差不大于（）mm。
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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
能防止血细胞凝集和血栓形成，改善血流的胶体液为()
A. 全血
B. 血浆
C. 清蛋白
D. 低分子右旋糖酐
E. 羟乙基淀粉(代血浆)
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