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问题 单项选择题

数据库技术的奠基人之－E.F.Codd于1970年发表过多篇论文，主要论述的是 ( )。

A．层次数据模型

B．网络数据模型

C．关系数据模型

D．面向对象数据模型

答案

参考答案：C

单项选择题

下列关于脑血流灌注显像剂特性的说法中，错误的是（）。

A.具有通过血脑屏障的能力

B.其带有负电荷，因此能通过血脑屏障膜

C.其具有脂溶性

D.相对分子质量小

E.具有确定的脑分布区域
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单项选择题

When anyone opens a current account at a bank, he is lending the bank money. He may (1) the repayment of the money at any time, either (2) cash or by drawing a check in favor of another person. (3) , the banker-customer relationship is that of debtor and creditor who is (4) depending on whether the customer’s account is (5) credit or is overdrawn. But, in (6) to that basically simple concept, the bank and its customer (7) a large number of obligations to one another. Many of these obligations can give (8) to problems and complications but a bank customer, unlike, say, a buyer of goods, cannot complain that the law is (9) against him.

The bank must (10) its customer’s instructions, and not those of anyone else. (11) , for example, a customer opens an account, he instructs the bank to debit his account only in (12) of checks drawn by himself. He gives the bank (13) of his signature, and there is a very firm rule that the bank has no right or (14) to pay out a customer’s money (15) a check on which its customer’s signature has been (16) It makes no difference that the forgery may have been a very (17) one: the bank must recognize its customer’s signature. For this reason there is no (18) to the customer in the practice, (19) by banks, of printing the customer’s name on his checks. If this (20) Forgery, it is the bank that will lose, not the customer. (254 words)

19（）

A.engaged

B.intended

C.adapted

D.adopted
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