【单选题】下列有国家制定或认可,靠国家强制力保证实施,具有强制性的是:( )
【简答题】输出一个字典中所有的唯一值 (unique value)
【单选题】This party is quit formal so you'd better not wear _________ clothes. [ ]
【单选题】You'd better _____ to the concert. [ ]
【单选题】You’d better an orange coat when you take part in the exam. It may .
【单选题】You’d better wear a pair of comfortable trainers when ________a long walk.
【简答题】865 根据“偶数法则”保留 4 位有效数字为多少? (有效数字)