心房颤动时，心电图鉴别室性早搏与心室内差异传导，下列哪项最有帮助（） A.异常QRS

已知甲和乙在溶液中的转化关系如图所示：

　 请回答下列问题：

（1）若甲是10电子的单核微粒，乙是两性氢氧化物，则微粒甲的结构示意图为　　　　　　　　 。

（2）若甲是10电子的阳离子，乙是碱性气体。1mol乙通入足量强酸溶液中与H^＋反应，反应过程中能量变化如下图：

写出乙的一种用途:　　　　　　　　　　　　　;

该反应的热化学方程式是___________________________。

（3）若甲是CrO₄^2－(黄色)和Cr₂O₇^2－(橙色)的混合溶液，在该溶液中存在如下平衡：

CrO₄^2－(黄色) + 2H^＋ Cr₂O₇^2－(橙色) + H₂O

若测得甲溶液的pH＝1，该溶液显　　 　　色。

（4）若甲仅含有NO₃^－、SO₄^2－和X三种离子，则X离子可能是　　　　(填序号) 。

A．Fe²⁺

B．HCO₃^－

C．Ba²⁺

D．Fe³⁺（5）若甲是CO₂，乙中HCO₃^－和CO₃^2－的物质的量浓度相等，此时溶液的pH=10，

则HCO₃^－的电离平衡常数K_a＝　　　　　　　 　。

加油站的汽油罐和柴油罐应（）。

A、埋地设置

B、设在室内

C、设在地下室

D、露天设置

某女士，因子宫破裂胎儿死亡，行子宫切除术，术后制定心理护理措施，哪项不正确（）。

A.允许产妇诉说内心感受

B.适当时候向其解释胎儿死亡原因

C.鼓励家属多陪伴

D.观察其情绪变化

E.安排与哺乳产妇同住一室

滚齿机传动链的误差，将在滚齿时使所加工轮齿产生周节误差。

阅读理解。

     People travel for a lot of reasons. Some tourists go to see battlefields or religious shrines.

Others are looking for culture, or simply want to have their picture taken in front of famous

places. But most European tourists are looking for a sunny beach to lie on.

     Northern European are willing to pay a lot of money and put up with a lot of inconveniences

for the sun because they have so little of it. Residents of cities like London, Copenhagen, and

Amsterdam spend a lot of their winter in the dark because the days are so short, and much

of the rest of the year in the rain. This is the reason the Mediterranean has always attracted

them. Every summer, more than 25 million people travel to Mediterranean resort and beaches

for their vacation. They all come for the same reason: sun!

     The huge crowds mean lots of money for the economies of Mediterranean countries. Italy's

30,000 hotels are booked solid every summer. And 13 million people camp out on French

beaches, parks and roadsides. Spain's long sandy coastline attracts more people than anywhere

else. 37 million tourists visit yearly, or_one_tourist_for_every_person_living_in_Spain.

     But there are signs that the area is getting more tourism than it can handle. The Mediterranean

is already one of the most polluted seas on earth. And with increased tourism, it's getting worse.

The French can't figure out what to do with all the garbage left by campers around St. Tropez.

And in many places, swimming is dangerous because of pollution.

     None of this, however, is spoiling anyone's fun. The Mediterranean gets more popular every

year with tourists. Obviously, they don't go there for clean water and solitude. They tolerate traffic

jams and seem to like crowded beaches. They don't even mind the pollution. No matter how dirty

the water is, the coastline still looks beautiful. And as long as the sun shines, it's still better than

sitting in the cold rain in Berlin, London, or Oslo.

1．The writer seems to imply that Europeans travel mostly for the reason that ________.

A．they want to see historic remains or religious spots

B．they are interested in different cultural traditions and social customs

C．they would like to take pictures in front of famous sites

D．they wish to escape from the cold, dark and rainy days back at home

2．In Paragraph 2, cities like London, Copenhagen, and Amsterdam are mentioned________.

A．to show that they are not good cities in terms of geography and climate

B．to tell us how wealthy their residents are

C．to suggest that these cities lack places of historic interest and scenic beauty

D．to prove that they have got more tourism than they handle

3．The latter half of the last sentence in Paragraph 3, "or one tourist for every person living in Spain"

means ________.

A．all the 37 million people living in Spain are tourist

B．every year almost as many tourists visit Spain as there are people living in that country

C．every person living in Spain has to take care of a tourist

D．every Spanish is visited by a tourist every year

4．According to the passage, which of the following factors might spoil the tourists' fun at Mediterranean

resorts and beaches?

A．Polluted water.  

B．Crowded buses.

C．Traffic jams.  

D．Rainy weather.