问题 问答题 论述题

《煤矿安全规程》对每一个采煤工作面的安全出口有什么规定?

答案

参考答案:每一个采煤工作面,必须经常保持两个以上的畅通无阻的安全出口,一个通到回风巷道,另一个通到进风巷道。开采三角煤、断层带、残留煤柱或地质构造极为复杂的煤层,不能采用正规采煤方法的采煤工作面,确实不能保持两个安全出口时,必须制定安全措施,报矿务局总工程师批准。开采有瓦斯喷出、煤与瓦斯(二氧化碳)突出危险或突水危险的煤层时,严禁采煤工作面只有一个安全出口。采煤工作面所有安全出口与巷道连接处的20m范围内,必须加强支护,巷道高度不得低于1.6m,但综合机械化采煤工作面所有安全出口与巷道连接处的20m范围内,巷道高度不得低于1.8m。安全出口必须设专人维护,支架有断梁折柱时,必须及时更换。

单项选择题

Deflation is an economic theory relating changes in the price levels to changes in the quantity of money. In its developed (1) , it constitutes an analysis of the (2) underlying inflation and deflation. As (3) by the English philosopher John Locke in the 17th century, the Scottish (4) David Hume in the 18th century, and (5) , it was a weapon (6) the mercantilists, who were thought to equate wealth with money. If the (7) of money by a nation merely raised (8) , argued the quantity theorists, then a "favourable" balance of trade, (9) desired by mercantilists, would increase the supply of money but would not in-crease (10) . In the 19th century the quantity theory (11) to the ascendancy of free trade over protectionism. In the 19th and 20th centuries it played a part in the (12) of business cycles and in the theory of foreign (13) rates.

The (14) theory came under attack during the 1930s, (15) monetary expansion seemed ineffective in combating deflation. Economists argued that the levels of investment and government spending were more important than the money supply in determining economic activity.

The tide of opinion (16) again in the 1960s, when experience (17) post-World WarⅡ inflation and new empirical (18) of money and prices— (19) A Monetary History of the United States (1963) by Milton Friedman and Anna Schwartz—restored much of the quantity theory’ s lost prestige. One implication of this theory is that the size of the stock of money must be considered when shaping governmental policies (20) to control prices and maintain full employment.

16()

A.reversed

B.occurred

C.emerged

D.finished

单项选择题