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问题 单项选择题

在SQLSELECT语句中用于实现关系的选择运算的短语是

A．FOR

B．WHILE

C．WHERE

D．CONDITION

答案

参考答案：C

解析：本题考查对SQL语句中WHERE子句的理解。在SQL语句中， WHERE用来描述查询条件(即进行选择运算)，SQL语句中没有FOR、CONDITION或 WHILE等短语或关键字。

单项选择题

Shanna: Owners of any work of art, simply by virtue of ownership, ethically have the right to destroy that artwork if they find it morally or aesthetically distasteful, or if caring for it becomes inconvenient.
Jorge: Ownership of unique artworks, unlike ownership of other kinds of objects carries the moral right to possess but not to destroy. A unique work of art with aesthetic or historical value belongs to posterity and so must be preserved, whatever the personal wishes of its legal owner.
On the basis of their statements, Shanna and Jorge are committed to disagreeing about the truth of which one of the following statements

A．Anyone who owns a portrait presenting his or her father in an unflattering light would for that reason alone be ethically justified in destroying it.

B．People who own aesthetically valuable works of art have no moral obligation to make them available for public viewing.

C．Valuable paintings by well-known artists are seldom intentionally damaged or destroyed by their owners.

D．If a piece of sculpture is not unique, its owner has no ethical obligation to preserve it if doing so proves burdensome.

E．(E) It is legally permissible for a unique and historically valuable mural to be destroyed by its owner if he or she tires of it.
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判断题

“化学品首次进口”是指外商或其代理人向中国出口其未曾在中国登记过的化学品，只要该化学品已有其他外商或其代理人在中国进行了登记，则不视为化学品首次进口。
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