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【单选题】
关于优化查询说法中正确的是______。A.
避免或简化排序的目的是实现查询优化
B.
在保证数据库一致性的前提下，将频繁操作的多个可以分割的处理过程放在一个存储过程中，这样可以大大提高系统的响应速度
C.
使用临时表会占用较多的系统资源，尤其对于大规模并发量的情况下，很容易使得系统资源耗尽而崩溃
D.
相关子查询的使用可以加速查询
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【单选题】--Do you prefer skating ___________ marathon? --I like ___________ of them.
A.
to…neither
B.
or…either
C.
to…none
【单选题】The author cites Mr. Smiths survey in order to show that______.
A.
most immigrants are either highly skilled or poorly unskilled
B.
immigrants take up a larger proportion of American population than the natives
C.
immigrants are mostly those who haven't received good education in their own countries
D.
there are more highly-skilled immigrants in America than unskilled immigrants
【单选题】What does the professor say about discontinuous permafrost?
A.
It is subcategorized as either extensive or sporadic.
B.
It is an early indicator of periods of global warming or glaciation.
C.
It covers approximately 24% of Earth's land area.
D.
It is the most common form. of permafrost.
【简答题】结构化程序设计采用工程化、规范化、模块化、结构化的设计方法。其设计思想 是"自顶向下, "。
【简答题】[ Bill of Exchange The majority of international payments are made by way of bills of exchange either with or without a documentary credit. There are five parties to a bill of exchange : drawer, drawe...
【简答题】厌氧氧化塘一般与( )氧化塘串联使用,塘深度大,约( )~4m深,占地( ),所需动力也( );承受高负荷时易产生( )味,对温度比较( )。
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