TD-SCDMA系统的物理信道采用三层：物理层（L1）、数据链路层（L2）、网络层（L3）。
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动脉血流经组织时，接受__________放出__________，转变为静脉血的过程称为组织换气。
汽车变速器通过换档，可在发动机输出功率不变的情况下（）。
A. 获得不同的速度和牵引力
B. 决定装载货物的多少
C. 减轻司机的劳动强度
You need to recommend a backup strategy for Hyper-V. What should you recommend？（）
A. Take a snapshot of each VM， and then run a full backup of the Hyper-V hosts by using Windows Server Backup.
B. Shut down the VMs，and then run a full backup of the Hyper-V hosts by using Windows Server Backup. Restart the VMs when the backup is complete.
C. From each VM,run a full backup by using Windows Server Backup， and then run a full backup of the Hyper-V hosts by using Windows Server Backup.
D. From each VM,run a full backup by using Windows Server Backup. Shut down the VMs， and then run a full backup of the Hyper-V hosts by using Windows Server Backup. Restart the VMs when the backup is complete.
某施工单位安全生产设施不符合国家规定，造成3人死亡多人重伤，应认定为（）。
A. 工程重大安全事故罪
B. 重大劳动安全事故罪
C. 重大责任事故罪
D. 重大伤亡事故罪
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