“四群四带”城市化战略格局中的“四群”是指北部湾城市群、（） A.桂西城市群 B.桂

钾是活泼的碱金属，钾和氧有氧化钾（K₂O）、过氧化钾（K₂O₂）和超氧化钾（KO₂）等多种化合物．

（1）钾和硝酸钾反应可制得氧化钾：K+KNO₃→K₂O+N₂（未配平），每生成9.4gK₂O消耗的还原剂有______g；

（2）超氧化钾和过氧化钾都能与二氧化碳反应均生成氧气和K₂CO₃，在医院、矿井、潜水、高空飞行中用作供氧剂．写出超氧化钾与二氧化碳反应的化学方程式______，为了维持气压稳定，可以使用超氧化钾和过氧化钾的混合物使吸收的CO₂与生成的O₂体积相同（同温同压），则它们的物质的量之比为n（KO₂）：n（K₂O₂）=______；

（3）KO₂加热至600℃部分分解得到产物A．6.30g产物A充分吸收二氧化碳生成碳酸钾并产生氧气1.12L（标准状况），试确定产物A中钾氧两种原子个数之比．______如果产物A只含有两种化合物，写出所有可能的化学式并计算A中两种化合物的物质的量之比．______．

房地产间接投资的形式主要有______。

A．投资房地产投资信托基金

B．购买住房抵押支持证券

C．购买房地产企业债券

D．购买物业用于出租经营

E．购买土地进行开发

如图所示的电路中，电源电动势为12 V，内电阻为1 Ω，R₁=1 Ω，R₂=6 Ω，电动机线圈电阻为0.5 Ω，若开关闭合后通过电源的电流为3A，则R₁上消耗的电功率为_______W，电动机消耗电功率为_______W。

环境质量评价中，Brown指数是（）

A.水质评分加权型水质指数

B.比值算术均数型水质指数

C.比值加权型水质指数

D.比值简单叠加型水质指数

E.综合性水质指数

Developing reliable software on time and within (106) represents a difficult endeavor for many organizations.
Usually business solutions have three main aspects: people, (107) , and technology. The main reason for failing software projects has little to do with .technology and tools, and much to do with lack of process (108) . Experience has shown that introducing new technology and tools in an immature or undisciplined environment is likely to increase the chaos. CASE tools are not enough. "A fool with a tool is still a fool!"
Structured method was the first wave of the software industry. This was the beginning of transforming software development from a" (109) industry to mass production. Software process movement if the second wave in the software industry. The process maturity movement prepares the way for the third wave of the software industry: "software industrialization". Software development will become like an assembly and manufacturing process. A critical enabling factor is a disciplined software engineering process with predictable quality, (110) and functionality.

A．law

B．discipline

C．plan

D．evaluation