分析下列各种局部排风罩的工作原理和特点。 （1）防尘密闭罩；（2）外部吸气罩；（3

补充诗句并解释句意。

1．莫笑农家腊酒浑，（　　　　　　　）。

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2．（　　　　　　　），柳暗花明又一村。

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读“六大板块示意图”，完成下列问题。

（1）写出字母代表的六大板块的名称。

A________板块，B___________板块，C_________板块，

D________板块，E___________板块，F_________板块。

（2）从图中箭头看，正在相互挤压的板块有：

________________________；________________________；________________________。

（3）正在相互拉伸的板块有：_________________。

（4）我国处在________、________、________之间。

在某工程双代号网络计划中，如果以某相同关键节点为完成节点的工作有3项，则该3项工作( )。

A．全部为关键丁作
B．至少有一项为关键工作
C．自由时差相等
D．总时差相等

监理单位应当对专项方案实施情况进行（）

Though it is mere 1 to 3 percent of the population, the upper class possesses at least 25 percent of the nation’s wealth. This class has two segments: upper-upper and lower-upper. Basically, the upper-upper class is the "old rich"—families that have been wealthy for several generations—an aristocracy of birth and wealth. Their names are in the Social Register, a listing of acceptable members of high society. A few are known across the nation, such as the Rockefellers, Roosevelts, and Vanderbilts. Most are not visible to the general public. They live in grand seclusion, drawing their income from the investment of their inherited wealth. In contrast, the lower-upper class is the "new rich". Although they may be wealthier than some of the old rich; the new rich have hustled to make their money like everybody else beneath their class. Thus their prestige is generally lower than that of the old rich, who have not found it necessary to lift a finger to make their money, and who tend to look down upon the new rich.

However its wealth is acquired, the upper class is very, very rich. They have enough money and leisure time to cultivate an interest in the arts and to collect rare books, painting, and sculpture. They generally live in exclusive areas, belong to exclusive social clubs, communicate with each other, and marry their own kind—all of which keeps them so distant from the masses that they have been called the out-of-sight class. More than any other class, they tend to be conscious of being members of a class. They also command an enormous amount of power and influence here and a broad, as they hold many top government positions, run the Council on Foreigh Relations, and control multinational corporations. The actions affect the lives of millions.

The reason why the "old rich" look down upon the "new rich" is that（）

A. the former are wealthier than the latter

B. the latter sweat themselves to make money

C. the "new rich" have no interest in arts

D. the "old rich" are conscious of being members of the upper class