社会主义初级阶段国家的经济基础对国家发展的意义。（12分）

下列叙述正确的是[ ]

A．在原电池的负极和电解池的阴极上都是发生失电子的氧化反应

B．用惰性电极电解Na₂SO₄溶液，阴阳两极产物的物质的量之比为1：2 　

C．用惰性电极电解饱和NaCl溶液，若有1 mol电子转移，则生成1 mol NaOH 　

D．镀层破损后，镀锡铁板比镀锌铁板更耐腐蚀

“腐肉生蛆（qu）”是日常生活中常见的现象．有的同学认为“蛆是腐肉变成的”，有的同学认为“蛆是蝇在腐肉上产生的”．请根据这一现象作出你的假设，设计探究方案，并对结果进行预测和分析．

（1）你作出的假设是：______．

（2）请补充完整探究方案：

①将两块大小相同的煮熟的猪肉分别放在两个同样大小的湿润玻璃碗里，编号为：A、B

②在A玻璃碗口覆盖纱布，B玻璃碗口敞开；并把A、B玻璃碗放在______ （填写相同或不同）的适宜条件（包括有苍蝇出没）下培养．

③每天______ 两个玻璃碗中的生蛆情况．

（3）实验结果与结论：

实验结果：A 玻璃碗中没有生出蛆、B玻璃碗中生有出蛆．

实验结论：假设______ （填写“是”或“不”）成立的．

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (71) of the technical requirements for the software product.
During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each (72) that it must meet. The starting point is usually a set of high-level requirements from the (73) that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for the system and the defines (74) showing how the system will be operated, publishes the system and operation concept documents, and conducts a system concept review (SCR) .
Following the SCR, the team derives (75) requirements for the system from the highlevel requirements and the system operations concept. Using structured or object-oriented analysis, the temn specifies the software functions and algorithms needed to satisfy each detailed requirements.

A．criterion

B．standard

C．model

D．system

全脊椎麻醉首先出现症状是（）

A.神志消失

B.瞳孔散大

C.对光反射消失

D.脉搏微弱和面色苍白

E.呼吸停止并常伴有血压下降

乙型肝炎疫苗可以预防丙型肝炎。