题目内容
全外连接查询的特点是左、 右两端表中的记录都输出，全外连接查询中所有表中的记录信息都保留在结果集中。 如果没能找到匹配的元组， 就使用（ ）来代替。
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RandomAccessFile所实现的接口是__接口和DataOutput 接口
____所实现的接口是DataInput 接口和DataOutput 接口
2. Fill in each blank with a suitable preposition or adverb. （注意：如果一道题有两个空要用逗号隔开如in，on；注意大小写）1) British law requires that all children attend school _____ the ages of 5 and 16.2) Many other countries model their schools _____ British schools, and _____ good reason.3) _____ assembly or field trip days, a white shirt and dark tie replace the casual tee shirt.4) Regardless _____ a student’s score, he or she will move on to the next level of schooling.5) _____ completion of the exams, some students leave school and go straight to work6) Those preparing _____ university take advanced courses _____ one to five subjects.7) Like William, some British teenagers take a year _____ before college to have a break.8) Most university students live _____ campus in small single rooms.
我国电子商务起步，大约是从（ ）年开始的？
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