问题 选择题

下列知识整理的内容完全正确的一组是

A.除杂的方法 

CO2气体(CO气体)——通入氧气

CaCO3固体(CaO固体)——高温煅烧

NaCl溶液(CaCl溶液)——滴加碳酸钾溶液至恰好完全反应,过滤

B.物质与性质

硝酸铵——溶于水时吸热

加碘食盐——“碘”是指元素

锰酸钾——锰元素的化合价为+7

物质与用途

活性炭——可用于吸附冰箱内的异味

石油——被誉为“工业的血液”

硬铝——可用作制造飞机

D.食品与安全

亚硝酸钠——不能当食盐用

霉变食物——高温消毒后可食用

甲醛溶液——可作食品保鲜剂

答案

 

题目分析:A选项二氧化碳中混有一氧化碳,通入氧气会引进新杂质;B选项锰酸钾中锰元素的化合价为+6价;C选项是完全正确的叙述;D选项霉变食物高温消毒后不可使用;故答案选择C 

单项选择题 A3/A4型题
填空题

Happy Customers: Matter of Honor among Japanese


In an age when personal service as a significant aspect of merchandising is dying out in the Untied States, Japan clings tenaciously to it. Service is viewed by people in Japan not as a luxury, but as an essential ingredient for the success of individual companies and the Japanese economy as a whole.
Americans who move to Japan never get used to the range of services and courtesies taken for granted here. (1)
Supermarket check-out counters have two or three people ringing up and bagging groceries. Some stores deliver, with each bag arriving neatly stapled closed. (2)
Television shops normally send a technician to install and fine-tune a newly purchased set. (3) Car salespeople are known to bring new models around to customers’ homes for test drives and loaners are available for people whose cars are in for repairs.
There are no limits to what is home-delivered — video movies, dry cleaning, health foods, rented tailcoats (this last one requires tow visits from the sales staff, first for a fitting, second for delivery of the altered and freshly pressed garment). (4)
Japanese barbers often give back massages as part of an ordinary haircut. (5)
Department stores seem to have twice, if not three times the floor staff of American ones. (6) Upscale customers don’t have to come in at all — the goods are taken to their homes for display and selection.
Perhaps the darkest spot on personal service in Japan is how remarkably impersonal it can be. Everyone is treated exactly alike. (7) After a month’s stay in a hotel, guests may find the staff still has no idea who they are.
Still, the Japanese view service as the glue that holds commercial relationships together. If the correct personal contact and follow-up come with the first sale, a second is sure to come. Market share and loyal customers are the first goal, not short-term profit. (8)
A. The technician will rush back if anything goes wrong.
B. If they remove a customer’s eyeglasses, they may polish the lenses before returning them.
C. Employee’s cheery greetings and directions, in fact, are often memorized from a company manual.
D. Many stores wrap everything they sell.
E. Service may cost but it helps ensure these more important objectives.
F. Dry ice is inserted alongside the frozen foods to ensure that they don’t spoil on the way.
G. Office deliveries are common, too, especially of lunch.
H. To those old enough to remember how things used to be at home, life can bring on twinges of nostalgia.