问答题

某气态烷烃与丙炔的混合气体22.4L（标准状况），完全燃烧后生成121gCO2和40.5gH2O，则原混合气体中烷烃的化学式为（）

答案：正确答案：CxHy|C2H6

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It is this interdependency of the economic system which makes the power of trade unions such an important issue. Single trade unions have the ability to cut off many countries’ economic blood supply. This can happen more easily inBritainthan in some other countries, in part because the labor force is highly organized. About 55 percent of British worker belong to unions, compared to under a quarter in theUnited States. For historical reasons,Britain’s unions have tended to develop along trade and occupational lines, rather than on an industry-by-industry basis, which makes a wages policy, democracy in industry and the improvement of procedures for fixing wage levels difficult to achieve.
A、there is big difference between British trade unions and American trade unions.
B、Trade unions are vital in the British economic system.
C、The British trade unions have been working adversely.