优秀服务员的良好心理素质都是长期的()和自我修养的结果,只有不断实践锻炼,才会熟能生巧。
A、自我锻炼
B、自我培养
C、自我觉悟
D、自我控制
参考答案:A
Three fourths of the bread _______ by Bob, and the rest of the bread _______ left on the table. [ ]
A. was eaten; were
B. were eaten; was
C. were eaten; were
D. was eaten; was
数据管理技术发展阶段中,人工管理阶段与文件系统阶段的主要区别是文件系统
A.数据共享性强
B.数据可长期保存
C.采用一定的数据结构
D.数据独立性好