在一个密闭容器内有M、N、X、Y四种物质，在一定条件下反应一段时间后，测得反应前

发布时间：2017-07-16 01:15 │ 来源：www.tikuol.com

题型：选择题

问题：

在一个密闭容器内有M、N、X、Y四种物质，在一定条件下反应一段时间后，测得反应前后各物质的质量如下：

物质	M	N	X	Y
反应前的质量/g	8	11	18	10
反应后的质量/g	8	33	4	2

下列能正确表示密闭容器中化学变化说法正确的是（）

A．该反应为分解反应 B．该反应为化合反应

C．参加反应的N质量为22 D．M可能为该反应的催化剂

考点：化学反应方程式的书写化学图标化学反应方程式的配平化学反应方程式的意义

题型：选择题

阅读理解。

     Two friends are having a picnic together. Their names are Jim and Tim. Tim is very lazy. On the first
evening of their holiday Jim says to Tim,"Here's some money. Go and buy some meat."
     "I'm too tired," answers Tim. So Jim goes to buy the meat.
      Later he came back. He says to Tim,"Now here's the meat. Please cook it." But Tim answers, "No, I'm
not good at cooking. You do it." So Jim cooks the meat. Then he says to Tim, "Go and get some water."
     "No, I don't want to get my clothes dirty." Tim answers.
      At last Jim says, "The meal's ready. Go and eat it." "Yes, I'll do that," answers Tim. "I don't like saying
'No' all the time."

1. What's the Chinese for "lazy"?

[ ]

A. 累的
B. 懒的
C. 调皮的
D. 油滑的

2. — Why doesn't Tim cook meat?
— Because _______.

[ ]

A. he is tired
B. he's not good at cooking
C. he doesn't want to get his clothes dirty
D. he is very lazy

3. What does Tim do after the meal is ready?

[ ]

A. He eats it with Jim.
B. He puts dishes on the table.
C. He carries water.
D. He does everything.

4. What does he do before the meal?

[ ]

A. Nothing
B. Something
C. Say "No" twice (两次)
D. Have a picnic

5. What does Jim feel about Tim?

[ ]

A. Happy
B. Excited
C. Angry
D. Helpful

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题型：选择题

患者男，40岁，推销员。自述半小时前又突然感到气紧，胸闷，心悸，头晕，出汗，认为生命垂危，被送来急诊。近2个月来，这种情况发生过3次，每次持续约0.5～1小时，发病间歇期一切正常，发病与饮食无关。

最有助于鉴别诊断的项目是（）

A.追问起病诱因

B.血钾测定

C.心电图检查

D.PET

E.脑CT检查

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题型：选择题

当颁发向河道内排放化学物质的许可证时，它们是以每天可向河道内排放多少磅每种化学物质的形式来颁发的。通过对每种化学物质单独计算来颁发许可证。这些许可证所需数据是基于对流过河道的水量对排放到河道内的化学物质的稀释效果的估计。因此河道在许可证的保护之下，可以免受排放到它里面的化学物质对它产生的不良影响。上面论述基于的假设是：

A．相对无害的化学物质在水中不会相互反应形成有害的化合物。

B．河道内的水流动得很快，能确保排放到河道内的化学物质快速地散开。

C．没有完全禁止向河道内排放化学物质。

D．那些持有许可证的人通常不会向河道内排放许可证所允许的最大量的化学物质。

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题型：选择题

封闭式基金交易遵从( )原则。

A．价格优先

B．资本优先

C．数量优先

D．时间优先

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题型：选择题

每分钟释放到组织的氧的总量大约为（）

A.100ml

B.240ml

C.350ml

D.400ml

E.500ml

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