搜题请搜索小程序“爱下问搜题”
问题 选择题

下列数据是相应物质的近似pH，其中一定呈碱性的是（　　）

A．

（6.5～7.5）饮用水

B．

（4.0～4.4）番茄汁

C．

（2.0～3.0）柠檬汁

D．

（9.5～10.5）液体肥皂

答案

饮用水的pH在6.5和7.5之间，可能显酸性或显碱性或显中性；番茄汁、柠檬汁的pH小于7，显酸性．

液体肥皂的pH大于7，显碱性．

故选D．

单项选择题

工业建筑与其他民用建筑相比总平面设计最突出的特点是( )。

A．简单流线与复杂流线的差别

B．简单环境影响与复杂环境影响的差别

C．单一尺度与多尺度的差别

D．多学科、多工种密切配合
查看答案
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
查看答案