【单选题】用来维护两个表之间的一致性关系的约束是( )。
【单选题】1Africa is a huge continent with many countries. 2Many different areas are carved out of this one continent. 3Some areas have mountains. 4Some have deserts. 5Some have forests. 6With all the different...
【简答题】【T7】 A.CONCERNED B.IN C.CONTRIBUTES A.DO THEIR JOBS【T7】______THEIR OWN WAY B.AS FAR AS INCREASING PRODUCTIVITY IS【T8】______ C.HOW MUCH EACH WORKER【T9】______TO THE PRODUCT IN RECENT YEARS MANY COUNTRIE...
【单选题】人类经历过5次信息技术革命,其中第一次是
【简答题】根据所给的首字母填空(Unit4 Body Language 单元词汇) 1. As winter is a____ the weather is getting colder. 2. In some Asian countries s____ the head means “agreement”. 3. People now c___ over long distances by means o...
【单选题】SQLServer的6种约束中,用来维护两个表之间的一致性关系的约束是()。
【简答题】Directions: 新闻报道7题 In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only o...
【简答题】读材料和地图,回答下列各题。 根据索马里地区海盗猖獗的情况,在联合国的协调下,2010年3月4日,中国海军第五批护航编队从三亚某军港码头解缆起航,赴亚丁湾、索马里海域接替第四批护航编队执行护航任务。甲战士地理知识渊博,航行途中向战友介绍航线附近区域的地理特征。请根据以上材料和图1、图2完成甲战士介绍的内容。 (1)中国海军护航编队从三亚航行到索马里海域,途经太平洋和印度洋,连接这两个大洋的A为__...
【单选题】人类经历过5次信息技术革命,其中第一次是
【单选题】第1腕掌关节属于鞍状关节,能支配拇指的屈、伸、收、展、对掌,请问第1腕掌关节的组成结构是?