用温热药治疗寒证的方法，属于 A．热者寒之 B．寒者热之 C．热因热用 D．塞因塞用

原则上，凡能电沉积的金属或合金均可用于电铸，但目前在工业中广泛应用的只有（）。

A.铜和镍

B.锌和铁

C.铜和锌

D.镍和铁

人寿保险使用的生命表是由各个年龄、不同性别的人（）的组成的统计表。

A.给付率

B.死亡率和生存率

C.事故率

D.保险费率

阅读理解。

    Although man has known asbestos for many hundreds of years, it was not until 160 years ago that it was

mined for the first time on the North American continent.H.W.Johns, owner of a New York City Supply Shop

for roofers, was responsible for (对…负责) the opening of that first mine.

     Mr. Johns was given a piece of asbestos which had been found in Italy. He experimented with the material

and then showed its surprising powers to his customers. After putting on a pair of asbestos gloves, which

looked much like ordinary work gloves, he took red-hot coals from the fireplace and played with them in his

hands. How astonished the customers were to discover that he was not burned at all.You can well imagine that

he had increasing business in asbestos roofing materials. However, because it was very expensive to transport

(carry) them from Italy to the United States, Mr. Johns sent out a young scientist to seek a source nearer home.

This young man found great vein (岩脉), in the province of Quebec in Canada.

    Ever since 1881 Quebec has led the world in the production of this unusual mineral, which is made up of

magnesium, silicon, iron, and oxygen.When it is mined, the asbestos is heavy, just as you would expect a

mineral to be. When it is separated, a strange thing happens; the rock breaks down into fine, soft, soapy

fibres (纤维).

    Scientists do not know why the rock can be separated easily into threads (线), but they have found

thousands of uses of this fireproof material, of the so-called "cloth of stone".

1. Which title best expresses the main idea of this passage? [ ]

A. Asbestos mined in Canada

B. Fireproof matter

C. A "wonder" mineral

D. A new roofing material

2. Johns proved his ability as a salesman by _____. [ ]

A. going into roofing business

B. carrying asbestos from Italy

C. sending a trained scientist

D. showing the use of asbestos gloves

3. Which is the most important character of asbestos that the author wants to show us? [ ]

A. It is like thread.

B. It feels soapy.

C. It burns easily.

D. It is unusually heavy.

4. The author's main purpose in writing this passage was to _____. [ ]

A. show the need for more scientists

B. compare asbestos with other minerals

C. increase the sales of asbestos

D. present facts about asbestos

对流放热系数是（）对流换热过程强弱的指标，它在数值上等于温压为-1℃时，每平方米受热面积传递的热量。

A、表示

B、表现

C、表达

D、表征

装载超限货物的铁路货车技术检查应由车辆部门通知。