6.水泥砂浆和水泥混合砂浆搅拌时间不得少于( )min
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数据库恢复的重要依据是（ ）
A. 数据库管理员
B. 数据字典
C. 文档
D. 事务日志
一个事务的执行，要么全部完成，要么全部不做，一个事务中对数据库的所有操作都是一个不可分割的操作序列，这是事务的（ ）
A. 原子性
B. 一致性
C. 独立性
D. 持久性
The program in the poster is intended for
A. volunteers in nursing homes
B. doctors and medical students
C. students with no medical background
D. healthcare workers in community hospitals
What training will also be offered in the course in addition to CPR First Aid skills?
A. Housework slills.
B. Child and infant CPR.
C. Self-care guide for seniors.
D. Basic kmowledge of medicine.
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