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【单选题】
可用于分离或提纯物质的方法有： ①分馏 ②盐析 ③过滤 ④重结晶 ⑤升华 ⑥渗析 ⑦电解 ⑧加热分解 ⑨蒸馏 下列各组混合物的分离或提纯用上述哪种方法最合适？（   ） a．除去Ca（OH）2溶液中悬浮的CaCO3微粒 b．除去Fe（OH）3胶体中混有的Cl- c．除去乙醇中溶解的微量食盐 d．分离石油中各种不同沸点范围的成分 e．除去固体碘中混有的少量碘化钠 f．除去氧化钙中的碳酸钙
A.
a--③     b--⑥    c--⑨    d--①   e--⑤   f--⑧
B.
a--⑥     b--⑨     c--①    d--⑤    e--⑧  f--③
C.
a--⑨    b--①    c--⑤    d--⑧    e--③    f--⑥
D.
a--①   b--⑤   c--⑧   d--③   e--⑥   f--⑨
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参考答案：
举一反三
【判断题】When the sales order system is on-line, salespersons can immediately verify the inventory levels.
A.
正确
B.
错误
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【判断题】[判断题] ( )在每两个相连的感光度号数之间,差异的感光能力是两倍。
A.
正确
B.
错误
查看完整题目与答案
【简答题】Business Orders In business, an order is a spoken or written intention of a deal ( 交易 ) for specific products or services. From a buyer’s point of view it expresses the intention to buy and is called ...
查看完整题目与答案
【单选题】测定和了解耐火材料的高温使用性质，对提高产品（）和合理选用耐火材料都有直接意义。
A.
热震稳定性
B.
质量
C.
高温使用
查看完整题目与答案
【多选题】下列特性中，属于致密性耐火材料特性的有（ ）。
A.
质量较轻
B.
气孔率低
C.
耐磨性好
D.
体积密度低
E.
耐火度高
查看完整题目与答案
【简答题】III.Translate the following short paragraphs into Chinese. 1.When the purchase order of the buyer and the sales order of the seller agree, the orders become a contract between the buyer and the seller...
查看完整题目与答案
【单选题】It is known that the sales volume during the last six order period is 10,16,14,20,16,14t, C0 = 75 yuan, the average material storage fee during lead time C1 = 10 yuan / t, the safety factor α = 1. Usi...
A.
the order strategy of the goods is: check the inventory at any time, when it drops to 18t, place an order and the order quantity are 15t.
B.
the order strategy of the goods is: check the inventory at any time, when it drops to 18 boxes, place an order and the order quantity is 18 boxes.
C.
the order strategy of the goods is: check the inventory at any time, when it drops to 9 boxes, place an order and the order quantity are 7 boxes.
D.
the order strategy of the goods is: check the inventory at any time, when it drops to 26 boxes, place an order and the order quantity are 36 boxes.
查看完整题目与答案
【单选题】A seller intends to increase the price of a certain commodity in order to obtain more sales revenue, but as a result, the sales revenue decreases. When the demand price of the commodity is flexible( ...
A.
Inelastic
B.
elastic
C.
unit elastic
D.
perfect elastic
查看完整题目与答案
【简答题】测定和了解耐火材料的高温使用性质，对提高产品（）和合理选用耐火材料都有直接意义。
查看完整题目与答案
【单选题】计算机操作系统通常具有的五大功能是( )
A.
CPU管理,显示器管理,键盘管理,打印机管理和鼠标器管理
B.
启动,打印,显示,文件存取和关机
C.
处理器(CPU)管理,存储管理,文件管理,设备管理和作业管理
D.
硬盘管理,U盘管理,CPU的管理,显示器管理和键盘管理
查看完整题目与答案
相关题目：
【判断题】When the sales order system is on-line, salespersons can immediately verify the inventory levels.
A.
正确
B.
错误
查看完整题目与答案
【判断题】[判断题] ( )在每两个相连的感光度号数之间,差异的感光能力是两倍。
A.
正确
B.
错误
查看完整题目与答案
【简答题】Business Orders In business, an order is a spoken or written intention of a deal ( 交易 ) for specific products or services. From a buyer’s point of view it expresses the intention to buy and is called ...
查看完整题目与答案
【单选题】测定和了解耐火材料的高温使用性质，对提高产品（）和合理选用耐火材料都有直接意义。
A.
热震稳定性
B.
质量
C.
高温使用
查看完整题目与答案
【多选题】下列特性中，属于致密性耐火材料特性的有（ ）。
A.
质量较轻
B.
气孔率低
C.
耐磨性好
D.
体积密度低
E.
耐火度高
查看完整题目与答案
【简答题】III.Translate the following short paragraphs into Chinese. 1.When the purchase order of the buyer and the sales order of the seller agree, the orders become a contract between the buyer and the seller...
查看完整题目与答案
【单选题】It is known that the sales volume during the last six order period is 10,16,14,20,16,14t, C0 = 75 yuan, the average material storage fee during lead time C1 = 10 yuan / t, the safety factor α = 1. Usi...
A.
the order strategy of the goods is: check the inventory at any time, when it drops to 18t, place an order and the order quantity are 15t.
B.
the order strategy of the goods is: check the inventory at any time, when it drops to 18 boxes, place an order and the order quantity is 18 boxes.
C.
the order strategy of the goods is: check the inventory at any time, when it drops to 9 boxes, place an order and the order quantity are 7 boxes.
D.
the order strategy of the goods is: check the inventory at any time, when it drops to 26 boxes, place an order and the order quantity are 36 boxes.
查看完整题目与答案
【单选题】A seller intends to increase the price of a certain commodity in order to obtain more sales revenue, but as a result, the sales revenue decreases. When the demand price of the commodity is flexible( ...
A.
Inelastic
B.
elastic
C.
unit elastic
D.
perfect elastic
查看完整题目与答案
【简答题】测定和了解耐火材料的高温使用性质，对提高产品（）和合理选用耐火材料都有直接意义。
查看完整题目与答案
【单选题】计算机操作系统通常具有的五大功能是( )
A.
CPU管理,显示器管理,键盘管理,打印机管理和鼠标器管理
B.
启动,打印,显示,文件存取和关机
C.
处理器(CPU)管理,存储管理,文件管理,设备管理和作业管理
D.
硬盘管理,U盘管理,CPU的管理,显示器管理和键盘管理
查看完整题目与答案
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