备份是数据库管理的一项非常重要的工作,数据库何时被破坏以及会遭到什么样的破坏是不可预测的,因此必须制定详细的()。
A、恢复策略
B、计划策略
C、备份策略
D、目标策略
参考答案:C
当牙齿错位程度较严重时,使用较粗的镍钛圆丝,利用其较为柔和、持续的回弹力排齐牙齿。
根据句意及所给中文提示或英文解释,写出句中所缺单词,每空限填一个单词。
小题1:People like travelling in _________ (春天) because it is neither too hot nor too cold.
小题2:—What’s your father’s ________ (职业)?
—He is a doctor.
小题3:The 30th Olympic Games will be held in London, the ________ (首都) of England.
小题4:Lucy is polite and _______ (乐于助人的). We all like her.
小题5:Our maths teacher asked you to go to his office ________ (立即). He is waiting for you.
小题6:Colours can change our moods and some may make us feel _________ (in need of sleep).
小题7:Hurry up, or we can’t ________ (arrive at) the railway station on time.