数据库恢复通常基于数据备份和______。
参考答案：日志文件
In 1901, H. G Wells, an English writer, wrote a book_______ a trip to the moon. [ ]
A. describe
B. described
C. describing
D. to describe
维生素C注射液中抗氧化剂亚硫酸钠对碘量法有干扰，需要加入的掩蔽剂是
A．硼酸B．草酸C．丙酮D．酒石酸E．硫酸钙
