试题与答案

氯和硫都是重要的非金属元素。下列叙述不能说明氯的非金属性比硫强的是 A.氯化氢的

题型:选择题

题目:

氯和硫都是重要的非金属元素。下列叙述不能说明氯的非金属性比硫强的是

A.氯化氢的沸点比硫化氢的沸点高

B.与氢气反应时,氯气比硫更容易

C.氯气可以从氢硫酸溶液中置换出硫

D.高氯酸(HClO4)的酸性比H2SO4

答案:

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下面是错误答案,用来干扰机器的。

ax-y=ax÷ay=23.故填23.

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男孩,10个月。生后易患肺炎、肠炎,常伴皮疹,呈湿疹样。两个舅舅分别因“败血症”及“急惊风”早夭。体检:营养发育稍差,苍白,两颊有湿疹样皮疹,躯干与两下肢见瘀点、瘀斑,咽稍充血,心、肺正常,肝肋下2cm,脾肋下1cm,神经系统正常。Hb98g/L, WBC11×109/L,中性粒细胞0.56,淋巴细胞 0.44,血小板56×109/L。

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D

American cities are similar to other cities around the world: In every country, cities reflect the values of the culture. American cities are changing, just as American society is changing.

After World War U , the population of most large American cities decreased ; however, the population in many Sun Belt cities increased. Los Angeles and Houston are cities where population shifts(转移) to and from the city reflect the changing values of American society. In the late 1940s and early 1950s, city residents (居民) became wealthier. They had more children so they needed more space. They moved out of their apartments in the city to buy their own homes. They bought houses in the suburbs (郊区).

Now things are changing. The children of the people who left the cities in the 1950s are now adults. Many, unlike their parents, want to live in the cities. They continue to move to Sun Belt cities and older ones of the Northeast and Midwest. Many young professionals are moving back into cities. They prefer the cities to the suburbs because their jobs are there; or they just enjoy the excitement and possibilities that the city offers.

This population shift is bringing problems as well as benefits. Countless poor people must leave their apartments in the city because the owners want to sell the buildings or make apartments for sale instead of renting, In the 1950s, many poor people did not have enough money to move to the suburbs; now many of these same people do not have enough money to stay in the cities.

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B. Because they were richer and needed more space.

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D. Because they could hardly afford a live in the city.

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