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【单选题】
在数据库应用系统的需求分析阶段，设有如下工作： Ⅰ．分析与描述目标系统需要完成的功能 Ⅱ．分析与描述目标系统对响应时间、存储容量的要求 Ⅲ．分析与描述目标系统涉及的数据范围、数据的属性特征及数据之间的关系 Ⅳ．分析与描述每项功能活动需要的输人数据、业务规则及输出数据 Ⅴ．分析与描述目标系统的总体结构、功能活动及各功能活动之间的关系 以上属于系统功能建模内容的是A.
仅Ⅰ、Ⅳ和Ⅴ
B.
仅Ⅱ、Ⅳ和Ⅴ
C.
仅Ⅰ、Ⅱ和Ⅲ
D.
仅Ⅲ、Ⅳ和Ⅴ
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【简答题】三个连续奇数的和是21，则它们的积是（ ）。
【单选题】Checks and balances system Checks and balances system was based on division of powers. Congress is the Legislative branch. It consists of two chambers: the Senate and the House of Representatives.The ...
A.
executive
B.
legislative
C.
judicial
D.
supreme
【单选题】Which of the following statements concerning testing and maintenance of SARTs is true?
A.
An at-sea GMDSS maintainer is not able to test a SART as it is hermetically sealed.
B.
Testing a SART should be performed only in controlled environment as a test signal may be misinterpreted as a genuine distress situation.
C.
A SART's battery must be replaced within ninety (90) days after the expiration date imprinted on the unit.
D.
A SART's battery must be replaced within sixty (60) days after the expiration date im printed on the unit.
【单选题】I’m disappointed with the new officers elected in our club, but there is no point _____ about it. A. to worry B. in worrying C. with us worrying D. if we worry
A.
to worry
B.
in worrying
C.
with us worrying
D.
if we worry
【简答题】三个连续奇数的和是21，则它们的积是______．
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