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（15分）工业上设计将VOSO 4 中的K 2 SO 4 、SiO 2 杂质除去并回收得到V 2 O 5 的流程如下： 请回答下列问题： （1）步骤①所得废渣的成分是 （写化学式），操作I的名称 。 （2）步骤②、③的变化过程可简化为（下式R表示VO 2+ ，HA表示有机萃取剂）： R 2 (SO 4 ) n (水层)+ 2nHA（有机层） 2RA n （有机层） + nH 2 SO 4 (水层) ②中萃取时必须加入适量碱，其原因是 。 ③中X试剂为 。 （3）④的离子方程式为 。 （4）25℃时，取样进行试验分析，得到钒沉淀率和溶液pH之间关系如下表： pH 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 钒沉淀率% 88.1 94.8 96.5 98.0 98.8 98.8 96.4 93.1 89.3 结合上表，在实际生产中，⑤中加入氨水，调节溶液的最佳pH为 ；若钒沉淀率为93.1%时不产生Fe(OH) 3 沉淀，则溶液中c(Fe 3+ )$amp; 。〖已知：25℃时，Ksp[Fe(OH) 3 ]=2.6×10 -39 〗 （5）该工艺流程中，可以循环利用的物质有 和 。
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【判断题】停留时间的含义是：用户打开本店最后一个页面的时间减去打开本店第一个页面的时间点
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【单选题】74 Life cycle costing is the total cost to the customer for the acquisition and ownership over its full life. Life cycle costing categories include the cost of _____, _____, and _____.
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【单选题】67 Life Cycle Costing:
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is the concept of including all costs within the total life of a project.
B.
is an activity devoted to optimizing cost/performance
C.
is an activity of appraising the cost and technical performance of a completed project.
D.
is a process of predicting the life of a project.
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None of the above.
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【单选题】Life cycle costing is the total cost to the customer for the acquisition and ownership over its full life. Life cycle costing categories include the cost of _____, _____, and _____.
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. R & D, maintainability, operation and support.
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. Production, operations, maintenance.
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【单选题】156 Life cycle costing is the total cost to the customer for the acquisition and ownership over its full life. Life cycle costing categories include the cost of _____, _____, and _____.
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R & D, maintainability, operation and support.
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Acquisition, operations, maintenance.
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【判断题】停留时间的含义是：用户打开本店最后一个页面的时间减去打开本店第一个页面的时间
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【简答题】Target costing and life cycle costing练习题.docx
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【单选题】Life cycle costing is the total cost to the customer for the acquisition and ownership over its full life. Life cycle costing categories include the cost of _____, _____, and _____.
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R & D, maintainability, operation and support.
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【简答题】Target costing and life cycle costing练习题.docx
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