在做酸碱中和实验时,将稀盐酸滴入配制时间较长的氢氧化钠溶液中,发现有气泡产生。由

题型:填空题

问题:

在做酸碱中和实验时,将稀盐酸滴入配制时间较长的氢氧化钠溶液中,发现有气泡产生。由此判断氢氧化钠溶液中可能含有的杂质是___________;若要除去该杂质,可向该氢氧化钠溶液中加入_________;反应的化学方程式是______________________。

考点:中和反应及在实际中的应用
题型:填空题

孤立系统处在稳定平衡状态的必要和充分条件为()

题型:填空题

桥脑出血量超过多少毫升时称为巨大血肿()

A.10mL

B.15mL

C.20mL

D.25mL

E.30mL

题型:填空题

土的力学性质主要是( )。

A.低压缩性和抗剪强度

B.高压缩性和抗剪强度

C.压缩性和低抗剪强度

D.压缩性和抗剪强度

题型:填空题

FFather was a hardworking man who delivered bread as a living to support his wife and three children. He spent all his evenings after work attending classes,hoping to improve himself so that he could one day find a better. paid job. Except. for Sundays, Father hardly ate a meal together with his family. He worked and studied very hard because he wanted to provide his family with the best that money could buy.

Whenever the family complained that he was not spending enough time with them, he reasoned that he was doing all this for them. Though he often longed to spend more time with his family, he weighed his contribution to his family above everything else.

The day came when the examination results were announced. To his joy, Father passed, and with distinctions too! Soon after, he was offered a good job as a senior supervisor which paid handsomely.

Like a dream come true, Father could now afford to provide his family with life’s little luxuries like nice clothing,fine food and vacation abroad.

However, the family still did not get to see Father for most of the week. He continued to work very hard, hoping to be promoted to the position of manager. In fact, to make himself a worthily candidate for the promotion, he took another course in an open university.

Again, whenever the family complained that he was not spending enough time with them, he reasoned that he was doing all this for them. Though he often longed to spend more time with his family, he weighed his contribution to his family above everything else.

Father’s hard work paid off and he was promoted. Happily, he decided to hire a maid to relieve his wife from her domestic tasks. He also felt that their three-room flat was no longer big enough. It would be nice for his family to be able to enjoy the facilities and comfort of a condominium.  Having experienced the rewards of his hard work many times before, Father resolved to further his studies and work at being promoted again. The family still did not get to see much of him. In fact, sometimes Father had to work on Sundays entertaining clients.

 Over again, whenever the family complained that he was not spending enough time with them, he reasoned that he was doing all this for them. Though he often longed to spend more time with his family, he weighed his contribution to his family above everything else.

As expected, Father's hard work paid off again and he bought a beautiful condominium overlooking the coast of Singapore. On the first Sunday evening at their new home, Father declared to his family that he decided not to take any more courses or pursue any more promotions. From then on he was going to devote more time to

his family, and it was a promise.

Father did not wake up the next day.

小题1:Father worked and studied very hard because ________.

A.he had to support his family

B.he was enthusiastic in attending classes

C.he wanted to bring his family a better lire

D.he had to so as to reduce his family’s complaint小题2:What CAN’T Father get through his hard work?

A.Family time.

B.Higher education.

C.Better housing.

D.Vacation abroad.小题3:How would the family feel when “Father did not wake up the next day”?

A.To their joy, Father can have a good rest in the end.

B.They should have stopped Father from working so hard.

C.Thank God, Father can stay home with them.

D.There is no point working hard for a better life.小题4:What is the function of the italicized(斜体)paragraphs in this passage?

A.To make readers show sympathy for Father.

B.To show how stubborn Father was.

C.To make readers fee l how hard Father worked.

D.To imply a sad ending to the story.

题型:填空题

活络扳手的规格用长度×最大开口宽度表示,单位为mm,例如:150mm×19mm表示活络扳手长度150mm,开口宽度19mm。

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