[判断题] 使用电动砂轮机时,应检查开关、插座、插头、电线接头绝缘是否完好,翻越钢轨时,电线 应由轨底穿越,一人操作,一人配合。
A.正确
B.错误

• A. shine
• B. lie
• C. travel
• D. wash
• E. pay
• F. break
• G. repeat

The advantages and disadvantages of a large population have long been a subject of discussion among economists. It has been argued that the supply of good land is limited. To feed a large population, inferior land must be cultivated and the good land worked intensively. Thus, each person produces less and this means a lower average income than could be obtained with a smaller population. Other economists have argued that a large population gives more scope ]for specialization and the development of facilities such as ports, roads and railways, which are not likely to be built unless there is a big demand to justify them.
One of the difficulties in carrying out a world - wide birth control program lies in the fact that official attitudes to population growth vary from country to country depending on the level of industrial development and the availability of food and raw materials. In the developing country where a vastly expanded population is pressing hard upon t
A. there are too many underdeveloped countries in the world
B. underdeveloped countries have low level of industrial development
C. different governments have different views of the question
D. even developed countries may have complex problems