什么是夯实机械，夯实机械的特点及应用范围有哪些？

A. 劳动合同关系
B. 劳动行政法律关系
C. 劳动服务法律关系
D. 劳动法律渊源

A. 正确
B. 错误

A. To maintain control of updated rows for commit processing
B. To ensure only committed changes are altered by another application
C. To allow two applications to update the same row of data simultaneously
D. To prevent multiple applications from accessing the same data simultaneously