能正确表示下列反应的离子方程式是( )。 A.用铜做电极电解CuSO4溶液:2C

题型:选择题

问题:

能正确表示下列反应的离子方程式是(  )。

A.用铜做电极电解CuSO4溶液:2Cu2+2H2O2Cu+O2↑+4H

B.钠与CuSO4溶液反应:2Na+Cu2=Cu↓+2Na

C.明矾溶于水产生Al(OH)3胶体:Al3+3H2O=Al(OH)3↓+3H

D.向FeCl3溶液中加入Mg(OH)2:3Mg(OH)2+2Fe3=2Fe(OH)3+3Mg2

考点:离子方程式
题型:选择题

阅读理解。

     When you are in England, you must be careful in the streets because the traffic drives on the left.

Before you cross the street, you must look to the right and then the left. If the traffic lights are green, the

traffic can go. People on foot mustn't cross. In the morning and in the evening when people go to or come

from work, the streets are busy. The traffic is the most dangerous then.

     When you go by bus in England, you have to be careful too. Always remember the traffic moves on

the left. So you must be careful. Have a look first or you will go the wrong way.

In many English cities, there are big buses with two floors. From there you can see the city very well. It's

very interesting.

1. The traffic in England is _____ that in china.

A. the same as                      

B. different from

C. better than                      

D. worse than

2. When are there many buses, cars and people in the streets?

A. In the morning when people go to work.

B. At noon when people are having lunch.

C. In the evening when people come back from work.

D. Both A and C.

3. If you ride a bicycle in England, you must go _____.

A. on the left side of the road

B. on the right side of the road

C. in the middle of the road

D. very fast

题型:选择题

证券持有人可能面临预期收益不能实现的情况,这体现了证券的()特征。

A.期限性 

B.收益性 

C.流通性 

D.风险性

题型:选择题

原纤维中直接与收缩有关的蛋白质是()

A、肌凝蛋白

B、肌纤蛋白

C、肌凝蛋白和肌纤蛋白

题型:选择题

平行承发包的一般工作程序应为( )。

A.施工图设计完成→施工招投标→施工→完工验收
B.施工招投标→施工图设计完成→施工→完工验收
C.施工图设计完成→完工验收→施工招投标→施工
D.施工图设计完成→施工→施工招投标→完工验收

题型:选择题

员工应处处礼让宾客,以客人为先,并主动为客人让路、开门、呼梯。

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