等质量的两份锌粉a和b,分别加入过量的稀硫酸中,a中同时加入少量CuSO4溶液,

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问题:

等质量的两份锌粉a和b,分别加入过量的稀硫酸中,a中同时加入少量CuSO4溶液,下列各图中表示其产生氢气总体积(V)与时间(t)的关系正确的是(  )

A.

B.

C.

D.

考点:影响化学反应速率的因素原电池原理电解池原理
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3.6÷2表示(    )。 

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Richard’s father died when he was five. Later on he      his mother again. The poor boy had to live on his own, so he went to work for a rich farmer, who paid him nothing except food and clothes. An old woman felt      for him and often helped him. The boy wanted to go to      very much, but he had no money. But he never gave up and found some old books near the school and      himself to read and write.
There was a narrow path(小路) between two mountains which connected the village and the town. One morning people      there was a big stone on the path. It brought them difficulty: they had to cross the mountains to the town, or they had to move it away.      the stone weighed at least thirty tons and even the strongest young man couldn’t move it. They      for a long time, but nobody knew what to do.
Richard looked at it carefully for a while and said, “I have a      to move it away.” But      people believed him. Some villagers even laughed at him. The night fell and people went back. Only the boy stayed there. To their surprise, the villagers found the stone was       the next morning. They didn’t know who had moved it away. The old woman said Richard had done it all by himself.
“How could he?” the rich farmer called out, “He’s      fifteen! He couldn’t move it at all!”
“He dug(挖掘) a big hole beside the stone.” said the old woman, “and then he could       push it into the hole!”
Looking at each other, the villagers couldn’t say a word.
小题1:
A.lostB.lovedC.supportedD.helped
小题2:
A.angryB.proudC.sorryD.excited
小题3:
A.townB.mountainC.schoolD.bed
小题4:
A.asked B.taught C.agreedD.caused
小题5:
A.foundB.believedC.askedD.counted
小题6:
A.ForB.SoC.And D.But
小题7:
A.criedB.stayedC.playedD.discussed
小题8:
A.bookB.questionC.textD.way
小题9:
A.fewB.mostC.manyD.some
小题10:
A.brokenB.heavierC.goneD.smaller
小题11:
A.mainly B.only C.nearly D.already
小题12:
A.excitedlyB.easilyC.luckilyD.happily
题型:选择题

温病身热、干咳无痰,气逆而喘,胸满胁痛,咽干鼻燥,心烦口渴,舌边尖红,苔薄白而干,病机为()

A.风热邪袭肺卫

B.燥热邪在肺卫

C.燥热化火,伤及肺阴

D.燥热灼伤肺胃津液

题型:选择题

链激酶过量引起的出血可用()拮抗

A、鱼精蛋白

B、维生素K

C、氨甲环酸

D、枸橼酸钠

题型:选择题

DCC装置有那几种方法来控制稳定汽油蒸汽压()。

A、塔底重沸器返塔气体温度

B、回流

C、调节稳定塔压力

D、进料位置

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