-
题目：
未知类型
A.主码约束
B.指定默认值
C.参照完整性约束
D.限制取值范围
答案：
<查看本题扣1积分>
-
在克里特岛中发现的线形文字A已被成功破解。
-
During initial days of computing, software was largely developed by small groups of people. When this software was to be maintained by another set of people, it used to be a nightmarish experience. When large commercial projects were to be handled, it used to be analmost impossible task to keep the time and budget under control, and projects used to get delayed and many projects were abandoned halfway. There was no systematic procedure forthe software development; everything was done on ad hoc basis. This ad hoc approach led tothe 'software crisis'.Over the last few decades there has been a tremendous growth in information technologyand its impact on everyday life. Complex software systems have become critical to theoperation of many systems in areas such as banking, communications, manufacturing,power generation, and transportation. Progress in computer science and accumulated experience with industrial production of software have led to the emergence of software engineering as a separate discipline. The software engineering discipline has been defined as"the application of systematic, disciplined, quantifiable approaches to the development,operation, and maintenance of software. " that is, the application of engineering to software .The computer science discipline concerns with developing large applications. Software engineering covers not only the technical aspects of building software systems, but also management issues, such as directing programming teams, scheduling, and budgeting.For developing a software product, the development process is divided into differentstages. A convenient way of splitting the whole process is to divide the development into thefollowing five stages:Requirements Analysis & Specification: define the system requirements in detailDesign: specify system architecture and modules in detailCoding: produce source codeTesting: deal with unit testing and system testingMaintenance: fix bugs, enhance features and adapt across platforms.{二)Tell whether the following statements are true (T ) or false ( F) according to the passage A.(根据上立的内容判断下列句子的正误。 )36. During initial days of the development of software, everything was done in discipline. ( )37. The definition of software engineering is "the application of systematic, disciplined,quantifiable approaches to the development, operation, and maintenance of software. " ( )38. For developing a software product, you need design, coding and testing. ( )39. software engineering is the application of engineering to software. ( )40. Software engineering only covers the technical aspects of building software systems. ( ) .
-
锚机的过载拉力不应小于：A.额定拉力的1.5倍B.额定拉力的1.25倍C.额定拉力的1.1倍D.额定拉力的2倍
-
与逐步完善的计划编制方法相对应的是（）
-
职工工资总额构成中，奖金是指支付给职工的（）
-
某企业年末流动资产总额为8000万元，其中存货5000万元，应收账款2000万元，流动负债6000万元，则该企业速动比率为（）。
-
在竖向分区给水方式中，其中气压水罐并列给水方式的优点有()。
-
室外综合温度与（）因素无关。
-
蒸甲基萘时为塔底进料，此为（）进料。
-
轨梁厂850轧机生产钢轨时使用的轧辊属于（）