Which TWO of the following are required to use the hot-swap memory feature of the x445 while being operating system independent？（）
A. Memory Mirroring must be enabled in the BIO
B. Redundant bit steering must be enabled in the BIO
C. DIMMs must be the same size and speed as the DIMMs being replaced.
D. Memory Mirroring must be enabled in the operating system.
E. DIMMs can be of same size or larger or same speed or faster.
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《客车运用限度表》中规定，15号车钩中心高度（空气弹簧充气状态）最高为（）mm。
A. 830
B. 850
C. 860
D. 890
钻孔灌注桩施工中，成孔后压灌混凝土并将钢筋笼插至设计深度成桩的成孔方法是()。
A. 旋挖钻
B. 潜水钻
C. 螺旋钻
D. 冲抓钻
220kV及以上电压等级的交流线路杆塔上及变电站构架上作业，应采取防静电感应措施。
A. 正确
B. 错误
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