当化学反应涉及到碱、酸等物质（）是反应过程中的一个重要参数。A、电导 B、pH C、

发布时间：2017-10-01 02:59 │ 来源：www.tikuol.com

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问题：

当化学反应涉及到碱、酸等物质（）是反应过程中的一个重要参数。

A、电导

B、pH

C、温度

D、浊度

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在○里填上“>”“<”或“=”。

900克○1千克 2千克○1500克 3千克○3000克

5000克○6千克 950克○1千克 8千克○7900克

20千克○9千克 99克○102克 1千克○990克

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ATM的虚电路中，一条（）中可以包含一定数量的（）.

A.虚信道，虚通路

B.虚通路，虚信道

C.逻辑信道，虚电路

D.标志信道，物理信道

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如下图所示，是某互助小组制作的一台简易电动机．用硬金属丝做两个支架，分别与电池的两级相连，用漆包线绕成一个矩形线圈，以线圈引线为轴．用小刀刮去轴的一端全部漆皮，另一端刮去半周漆皮将线圈放在支架上，磁体放在线圈下．接通电源并用手轻推一下线圈，线圈就会不停地转动起来．请问：

要使线圈的转动方向发生改变，请提出两个方案：

①（）．

②（）．

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1：5000地形图的比例尺精度是（）

A、5 m

B、0.1 mm

C、5 Cm

D、50 Cm

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Passage Three

Our culture has caused most Americans to assume not only that our language is universal but that the gestures we use are understood by everyone. We do not realize that waving good-bye is the way to summon a person from the Philippines to one’s side, or that in Italy and some Latin American countries, curling the finger to oneself is a sign of farewell.
Those private citizens who sent packages to our troops occupying Germany after World War II and marked them GIFT to escape duty payments did not bother to find out that "Gift" means poison in German. Moreover, we like to think of ourselves as friendly, yet we prefer to be at least 3 feet or an arm’s length away from others. Latins and Middle Easterners like to come closer and touch, which makes Americans uncomfortable.
Our linguistic (语言上的) and cultural blindness and the casualness with which we take notice of the developed tastes, gestures, customs and languages of other countries, are losing us friends, business and respect in the world.
Even here in the United States, we make few concessions (让步) to the needs of foreign visitors. There are no information signs in four languages on our public buildings or monuments; we do not have multilingual (多语言的) guided tours. Very few restaurant menus have translations, and multilingual waiters, bank clerks and policemen are rare. Our transportation systems have maps in English only and often we ourselves have difficulty understanding them.
When we go abroad, we tend to cluster in hotels and restaurants where English is spoken. Then attitudes and information we pick up are conditioned by those natives—usually the richer— who speak English. Our business dealings, as well as the nation’s diplomacy, are conducted through interpreters.
For many years, American dollars no longer buy all good things, and we are slowly beginning to realize that our proper role in the world is changing. A 1979 Harris poll reported that 55 percent of Americans want this country to play a more significant role in world affairs; we want to have a hand in the important decisions of the 21^st century, even though it may not always be the upper hand.

It can be inferred that Americans being approached too closely by Middle Easterners would most probably ______.

A．stand still

B．jump aside

C．step forward

D．draw back

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