His academic ________ is language history and change. A: speciality B: specialize C: specific D: species

冲煮咖啡时，咖啡粉与水量的比例（）。 A: POTATO B: ROBUSTA C: SPECIALITY D: BREWRATIO

Now hotpot is a very popular local speciality and can be in every corner of the city and almost every city of China. A: find B: see C: found D: eat

My friend has lived in New York for 10 years and loves Chinese food. He is familiar with all the ________ (special) of Chinatown restaurants. A: speciality B: specialties C: specialize D: specialized

Special Products Co. --how to order Our speciality is our convenient catalogue system. Instead of spending time going to a shop, you simply order it direct from will refund you for in full. Quality is our main criterion.

设有课程关系Course(课程号,课程名,学分,开设专业号,先修课程号)和专业关系Speciality(专业号,专业名),则课程关系Course的外键是( )

【单选题】设有课程关系Course(课程号,课程名,学分,开设专业号,先修课程号)和专业关系Speciality(专业号,专业名),则课程关系Course的外键是 A. 课程号和开设专业号 B. 仅有开设专业号 C. 课程号和先修课程号 D. 开设专业号和先修课程号

【单选题】现有两个集合: SPECIALITY={计算机专业,信息专业},POSTGRADUATE={李林,刘敏},这两个集合的笛卡尔积为()。 A. {(计算机专业，李林)，(计算机专业，刘敏)，(信息专业，李林) ，(信息专业，刘敏)} B. {(计算机专业，李林)，(信息专业，刘敏)} C. {(计算机专业，刘敏)，(信息专业，李林)} D. {计算机专业，信息专业，李林，刘敏}