电力企业经营目标的特征不包括（）。 A.接受性 B.预见性 C.检验性 D.激励性

Many people like to travel by plane, but I don't. An airport is usually far from the city. You have to get there early and wait for hours for the plane to take off and it's often late. You can't open the windows. You can't choose the food. Planes are fast, but it still takes hours to get out of the airport and into the city.

I like traveling by train I think trains are safe. Railway stations are usually in cities. When you are late for a train, you can catch another one. You can walk around in the train and open the windows.  You can see many interesting things on your way. I know it takes a little more time.

I also like cars. You can start your journey when you want to, and you don't need to get to a railway station or a bus stop. Also you can carry many things with you in a car. But sometimes there are too many cars on the roads.

小题1: Does everyone like to travel by plane?

A．Yes, we do.

B．No, I don't know.

C．Yes, he does.

D．No, not everyone.小题2:Where is an airport according to the passage?

A．It's usually far from the city.

B．It's usually in a big city.

C．It's usually near the city.

D．It's usually around the city.小题3: Which of the following sentences is TRUE?

A．You can choose food on the plane.

B．You can open the windows on the plane.

C．You can open the windows on the train.

D．Trains are not safe.小题4:The writer doesn't like traveling by plane, does he?

A．Yes, it does.

B．Yes, he does.

C．No, it doesn't.

D．No, he doesn't.小题5: If you take a car, you don't need to __

A．get to a railway station

B．get up early

C．carry many things

D．take money

某学生为探究钠与CO₂的反应，利用如下装置进行实验。

（已知PdCl₂能被CO还原得到黑色的Pd）

（1）请将上图各装置连接完整

       接      ，        接      ，        接      ，        接      。

（2）装置②制备CO₂时具有随开随用，随关随停的功能。简述该装置随关随停的理由

                                                                     ；

（3）若用稀盐酸与CaCO₃反应制备CO₂，在加稀盐酸时，发现CaCO₃与稀盐酸不能接触，而稀盐酸又不够了，为使反应能顺利进行，可向长颈漏斗中加入的试剂是              。

A．NaNO₃溶液

B．CCl₄

C．苯

D．稀硝酸（4）检查装置气密性并装好药品后，点燃酒精灯之前应进行的操作是                 

                     ，当观察到                                       现象时才点燃酒精灯。此步操作的目的是                                            。

（5）反应过程中CO₂足量，假如反应过程中有下列两种情况，分别写出两种情况下钠与CO₂反应的化学方程式。

①装置⑤PdCl₂溶液中观察到有黑色沉淀，装置①中固体成分只有一种，且向固体中加入稀盐酸产生能使澄清石灰水变浑浊的气体。                                       。

②装置①中钠的质量为0.46g，充分反应后，将装置①中的固体加入到足量稀盐酸中产生224mL（标准状况）CO₂气体，且溶液中还有固体残留。                        。

“府院之争”产生的根本原因是（  ）

A．北洋军阀内部的矛盾

B．总统与 * * 之间的矛盾

C．军阀与帝国主义之间的矛盾

D．美日之间争夺中国的矛盾

肱骨髁上骨折，最易损伤

A．肱二头肌

B．肱三头肌

C．肱动、静脉

D．肌皮神经

E．桡神经

可用性法则