运行中断路器在哪些情况下应停用重合闸？

澳大利亚研究人员最新的调查结果显示，银河系中十分之一的行星可能具备生命存在的必要条件。这些行星的平均“年龄”大多比太阳早10亿年，从理论上讲，在这个时间段，任何生命都有足够多的时间进化。 根据文意，理解准确的是( )。

A．澳大利亚研究人员完成了一次最新调查

B．银河系的行星可能存在生命

C．行星的平均“年龄”都比太阳早10亿年

D．最新发现银河系十分之一的行星可能存在生命

阅读理解。

                                                                   Head above Water

     TUVALU, a tiny country in the Pacific Ocean, has asked for help as it will be swallowed up by the sea.

     Storms and huge waves are a constant threat and none of Tuvalu's nine little islands is more than five

meters above the sea level. Salt water is already entering the country's drinking water supply, as well as

damaging plants that produce fruit and vegetables. Without urgent help, the country's days are numbered.

     But Tuvalu is not the first place to face sinking into the sea. Venice, a historic city in Italy best known

for its canals, has sunk about 24 cm over the past 100 years. Experts say that it will have sunk another 20-

50cm by 2050. A century ago, St. Mark's Square, the lowest point city, flooded about nine times a year.

Nowadays, it happens more than 100 times. While Venice is slowly sinking into the mud on which it stands,

global warming causes Tuvalu's rising sea level.

     The average global temperature has increased by almost 0.5 centigrade degrees over the past century;

scientists expect it rise by extra l-3 degrees over the next 100 years.

     Warmer weather makes glaciers (冰川) melt, adding more water to the ocean. The warmer temperatures

also make water expand, so it takes up more space, causing the sea level to rise. The sea level has risen about

10-25 cm in the last 100 years.

     The main cause of global warming is human pollution. Through burning coal, oil and gas, people have

been increasing the green-house gases in the atmosphere, such as CO₂. This adds to the power of the

greenhouse effect, making the planet even warmer.

     Many scientists believe that, if the warming is not stopped, there will be huge climate changes. The sea

level could rise by one meter this century.

     Should this come true-the sea will swallow up millions of homes and the world will be flooded with

"climate refugees" looking for somewhere to live?

1. We can infer from the second paragraph that _____.

A. Tuvalu is in danger of being swallowed up by the sea

B. all Tuvalu's islands are about five meters above the sea level

C. drinking water in Tuvalu has been destroyed

D. Tuvalu is often flooded by storms and waves

2. The author uses Tuvalu and Venice as examples in order to explain _____.

A. they are the first place sinking into the sea

B. they are both sinking into the mud where they stand

C. they will disappear in the future

D. their trouble is caused by global warming

3. Put the following events in the right order.

    a. Glaciers began to melt.

    b. People bum coal, oil and gas.

    c. The greenhouse effect is growing.

    d. The earth is getting warmer and warmer.

    e. The sea level is rising.

    f. More CO₂ is produced.

    g. Many places are sinking into the sea.

A. d,f,b,c,a,e,g

B. b,f,c,d,e,a,g

C. f,c,b,d,a,e,g

D. b,f,c,d,a,e,g

4. What does "climate refugees" mean?

A. People who are forced away from their homeland by climate.

B. Climate changes.

C. Rare animals.

D. Climate effect.

疏水柱层析分离原理？

孕40周，初产，宫口开全2小时，胎头棘下2cm，宫缩较前减弱，胎膜已破，胎心120次/分，产妇一般情况较好

胎头吸引器总牵引时间一般不超过______

A．10分钟
B．15分钟
C．20分钟
D．25分钟
E．30分钟

船舶自力脱浅时可采用：（）.Ⅰ.移（卸）载Ⅱ.等候高潮Ⅲ.车舵锚配合Ⅳ.拖船协助脱浅

A.Ⅰ～Ⅳ都对

B.Ⅰ～Ⅲ对

C.Ⅰ、Ⅲ、Ⅳ对

D.Ⅱ～Ⅳ对