【单选题】听力原文:M: My family and I will be leaving on January 5. Is there anything we need to do to the apartment before we leave? W: If you want your fifty-dollar deposit hack, you'll have to clean the stove an...
B.
She sells stoves and refrigerators.
C.
She's an apartment manager.
D.
She's a real estate agent.
【简答题】若关系模式R和S分别为:R(A,B,C,D)、S(B,C,E,F),则关系R与S自然联结运算后的属性列有( )个,与表达方式π1,3,5,6(σ3<6(R S))等价的SQL语句为: SELECT ( ) FROM R, S WHERE ( ) ; A.4B.6C.7D.8A.A,R.C,E,FB.A,C,S.B,S.EC.A,C,S.B,S.CD.R.A,R.C,S.B,S.CA.R.B=S.B...
【简答题】阅读理解。 Nowadays, we can know time very easily.Even a little child may know the time.We always ask 'What time is it?' Then people can tell me the exact time.But before the invention of clocks, it was ve...
【简答题】当一个国家生产一种产品的成本较低时,该国在这种产品的生产上具备比较优势,反之,则具备比较劣势。
【简答题】用括号内所给动词的适当形式填空(必要时加助动词或情态动词)。 She has never learned any new words by heart but has a vocabulary of more than 10,000 words. She(1) (begin)to learn English when she was five and a half. And the most su...
【简答题】Good morning, Mr. Blake. Take a seat, please. Welcome to the ___11____. Before we start, let me give you some idea of waht I'd like to talk about with you today. ___12____, you'll be given a few minut...
【单选题】英国古典经济学家( )提出,即使一个国家在生产上没有任何绝对优势,只要它与其他国家相比,生产各种商品的相对成本不同,那么,仍可以通过生产相对成本较低的产品并出口,来换取它自己生产中相对成本较高的产品,从而获得利益,这就是比较成本论。
【判断题】当一个国家生产一种产品的机会成本较低时,该国在这种产品的生产上具备比较优势,反之,则具备比较劣势。
【简答题】当一个国家生产一种产品的( )成本较低时,该国在这种产品的生产上具有比较优势,,反之,则具有比较劣势。