You are designing a strategy for migrating the UNIX user accounts to Active Directory. Which three actions should you perform?（）
A. Import the user accounts as inetOrgPerson objects.
B. Import the user accounts into Active Directory by using the Ldifde command-line tool.
C. Export all user accounts from the UNIX servers to a text file.
D. Export all user accounts and their passwords from the UNIX servers to a text file. Encrypt this file to achieve extra security.
E. Assign random passwords to each user object, and securely distribute the password to the users.
F. Create the same strong password for each user object, and require users to change their passwords at first logon.&e
男性，67岁，慢性咳嗽、咳痰20余年，进行性气急加重5年。1周前因感冒后病情恶化入院。血气分析（呼吸空气）示：pH7．30，PaCO228．6kPa（65mmHg），PaO6．4kPa（48mHg）。当即给予低流量（浓度）持续氧疗低流量（浓度）氧疗的机制在于（）
A. 氧离曲线右移、P50增加
B. 缺氧时组织氧提取增加
C. 利用氧离曲线特点在陡直部分增加少许氧分压即可使氧饱和度有较大幅度提高
D. 缺氧时血红蛋白代偿性增加
E. 缺氧时心输出量增加，氧输送量提高
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