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听力原文: My wife and I spent two weeks in London last year. We went there in the autumn. We think it is the best season to visit England. The weather is usually good and there aren't too many tourists in October. We stayed in a small hotel in the West End. It was convenient as we did most of our sightseeing on foot. Taxis were too expensive, we couldn't understand the bus routes, and my wife didn't like traveling on the underground. She said it made her feel sick. In fact, we enjoyed our holiday so much that we have already planned again for this year. We're going to take our umbrellas, though, I'm sure we'll need them sometimes. My wife and I spent two weeks in London last year. We went there in the【11】We think it is the best season to visit England. The weather is usually good and there aren't too many【12】in October. We stayed in a small hotel in the West End. It was convenient as we did most of our【13】on foot. Taxis were too【14】, we couldn't understand the bus routes, and my wife didn't like traveling on the underground. She said it made her feel sick. In fact, we enjoyed our holiday so much that we have already【15】again for this year. We're going to take our umbrellas, though, I'm sure we'll need them sometimes.
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【判断题】电子商务属于管理信息系统的应用。
A.
正确
B.
错误
【简答题】高锰酸钾是常用的氧化剂。工业上以软锰矿(主要成分是MnO 2 )为原料制备高锰酸钾晶体。下图是实验室制备的操作流程: 上述反应②的化学方程式: 已知: (1)加热软锰矿、KClO 3 和KOH固体时,不采用瓷坩埚而选用铁坩埚的理由是_______; 反应①的化学方程式为______。 (2)从滤液中得到KMnO 4 晶体的实验操作依次是________(选填字母代号,下同)。 A.蒸馏  B.蒸发...
【简答题】(12分)某化学兴趣小组的同学对实验室乙酸乙酯的制取和分离进行了实验探究。 【制备】下列是该小组同学设计的实验装置。回答下列问题: (1)仪器A的名称 ▲ ,装置中长导管的主要作用是 ▲ ; (2)证明锥形瓶中收集到乙酸乙酯的简单方法是 ▲ ; 【分离】锥形瓶中得到的产物是混合物,为了分离该混合物,设计了如下流程: (3)a试剂最好选用 ▲ ; (4)操作Ⅰ、操作Ⅱ分别是 ▲ A.过滤、分液 B....
【简答题】某课外小组模拟上述部分过程设计了如下实验装置制备硝酸(所有橡胶制品均已被保护) (1)工业上用氨气制取NO的化学方程式是 。 (2)连接好装置后,首先进行的操作是 。 (3)通入a气体的目的是 . (4)盛有Na 2 CO 3 溶液的烧杯为尾气处理装置,该装置中发生反应的化学方程式是 2NO 2 +Na 2 CO 3 =====NaNO 2 + + (5)已知:温度低于21.15°C时,NO 2 ...
【简答题】某化学兴趣小组的同学对实验室乙酸乙酯的制取和分离进行了实验探究. 【制备】下列是该小组同学设计的实验装置1.回答下列问题: (1)装置中长导管的主要作用是______ (2)证明锥形瓶中收集到乙酸乙酯的简单方法是______ 【分离】锥形瓶中得到的产物是混合物,为了分离该混合物,设计了如下流程2: (3)a试剂最好选用______,D的结构简式为______ (4)操作Ⅰ、操作Ⅱ分别是______...
【单选题】从信息系统的应用来看,制造企业的信息化包括管理体系的信息化、产品研发体系的信息化、以电子商务为目标的信息化。以下()不属于产品研发体系信息化的范畴。
A.
CAD
B.
CAM
C.
PDM
D.
CRM
【简答题】直接写得数: 0×27= 25×3×4= 500×60= 240×3= 30×6= 35×2×5= 12×30= 900÷30= 24×5= 19+12+38= 1000-667= 4×12=
【简答题】(16分) (1)下图为实验室制备、收集少量HCl的装置。 ①制备HCl所用药品为浓硫酸和浓盐酸,则甲的最佳装置应选用下图中的 。 ② 请解释能用浓硫酸和浓盐酸制备HCl气体的原因 。 ③ 装置丙用来吸收过量的HCl气体,为防止倒吸,则烧杯中应该装入水和 。 (2)以下为苯的取代反应的探究实验。 ① 按上图所示的装置图连接好各仪器。 ② 检验装置的气密性。 ③ 在A中加入适量的苯和液溴的混合液体,...
【简答题】50×60= 30×23= 240÷6= 0÷8= 490÷7= 480÷6= 50×80= 24×20= 10×90= 32×30= 810÷9= 720÷8= 50×40= 280÷4= 2 4 + 1 2 = 2 7 + 5 7 = 4 8 + 1 8 = 1 3 + 2 3 = 4 6 - 3 6 = 5 9 - 3 9 = 6 7 - 4 7 = 6 7 - 3 7 =
【简答题】口算 300×6= 80÷5= 12×30= 50×0×6= 280÷7= 0÷60= 20×50= 25×4-92= 24×3= 309÷3= 150+5= 200×4÷8=
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