什么是轻关键组分?
参考答案:
在精馏塔底馏出液中某组分的浓度要有严格限制,并在进料液中比该组分还轻的组分及该组分的绝大部分应在塔顶馏出液中采出,该组分被称为轻关键组分。
下列关于偶发性科学活动的论述中,正确的是
A.有经验的教师常常可以事先估计到儿童的偶发性科学活动
B.活动的时间、地点固定不变
C.活动的过程不容易受外界因素干扰
D.活动的主体具有强烈的内在探索动机
Accelerated analysis approaches emphasize the construction of (34) to more rapidly identify business and user requirements for a new system. As an accelerated analysis technology, (35) reads the program code and automatically generates the equivalent system model, and the code can be obtained from (36) All system analysis approaches require some form of (37) which includes those techniques to be used to identify or extract system problems and solution requirements from user community. (38) is a classical set of techniques used to collect information about system problems, opportunities, solution requirements, and priorities.
35()
A. eXtreme programming
B. model driven
C. reverse engineering
D. agile method