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粗TiCl4的精制时高沸点物质和低沸点物质分别用什么方法去除？

答案

参考答案：蒸馏除高沸点杂质

精馏除低沸点杂质

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The 2012 London Olympic Games are on the wa3'. You may have a nice trip in London with the help of the following information.
By  underground The underground is fast and convenient. There is a station every few blocks. Underground trains run from 5:30 a.m. to 12:00 midnight. You can get to any place e   1    .
By busTravelling by bus is a good way to see the city-, especially from the top of a double-decker bus. There is always a bus stop nearby. There are special tickets for c   2   under the age of 12.
"By trainTake a train to visit places outside London, like Hampton Court and Windsor Castle. You can use a Travelcard on the underground, buses and most trains. To p   3   your journey, get a map from the railwaystations, take some time to think about the places you want to visit.
By taxiLondon's black taxis are f   4   . Many visitors to London know they are good and comfortable. They Will cost you a few pounds, though. Take ataxi once, for the experience.
By b__5_
The "river bus" leaves from Westminster Pier and stops at different placesbetween Westminster and Greenwich Pier. A good way to see the city from the River Thames.
By carDon't drive your car in London! Car parks are very e   6   . You have to pay a special congestion charge (拥堵费) to drive your car into the city centre.
By bikeThere aren't many good bicycle lanes in London. Cycling with a large guided group is better than r   7   alone.
On footThe best way to visit the city! But look right and left before you cross a street. There are many beautiful sights waiting for you.
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单项选择题

用户分散而制造企业相对集中，自主创新以（）为主，消费品特别是耐用消费品制造大都是这种情况。

A.用户

B.生产者

C.制造企业

D.消费者
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