什么叫地形图的比例尺精度与测图精度？

(4分)已知AgCl为难溶于水和酸的白色固体，Ag₂S为难溶于水和酸的黑色固体。向

AgCI和水的悬浊液中加入足量的Na₂S溶液并振荡，结果白色固体完全转化为黑色固体：

(1)写出白色固体转化成黑色固体的化学方程式：         ▲              。

(2)白色固体转化成黑色固体的原因是：                ▲               。

The famous director of a big and expensive movie planned to film a beautiful sunset over the ocean, so that the audience could see his hero and heroine in front of it at the end of the film as they said goodbye to each other for ever. He sent camera team out one evening to film the sunset for him.

The next morning he said to the men, “Have you provided me with that sunset?”

“No, Sir,” the men answered.

The director was angry.  “Why not?”  he asked.

“Well,” one of the men answered, “we are on the east coast here, and the sun sets in the west. We can get you a sunrise over the sea, if necessary, but not a sunset.”

“But I want a sunset!” the director shouted. “Go to the airport, take the next flight to the west coast, and get one.”

But then a young secretary had an idea. “Why don’t you photograph a sunrise,” she suggested, “and then play it backwards, Then it’ll look like a sunset.” “That’s a very good idea!” the director said. Then he turned to the camera team and said, “Tomorrow morning I want you to get me a beautiful sunrise over the sea.”

The camera team went out early the next morning and filmed a bright sunrise over the beach in the middle of a beautiful bay. Then at nine o’clock they took it to the director. “Here it is, Sir,” they said, and give it to him. He was very pleased.

They all went into the studio. “All right,” the director explained, “now our hero and heroine are going to say goodbye. Run the film backwards so that we can see the sunset behind them.”

The “sunset” began, but after a quarter of a minute, the director suddenly put his face in his hands and shouted to the camera team to stop. The birds in the film were flying backwards away from the beach.

小题1:One evening, the director sent his camera team out ______.

A．to watch a beautiful sunset.

B．to find an actor and an actress.

C．to film a scene on the sea.

D．to meet the audience.小题2:Why did the director want to send his team to the west coast?

A．Because he changed his mind about getting a sunset

B．Because he was angry about his team

C．Because it was his secretary’s suggestion

D．Because he wanted to get a scene of sunset小题3:Which of the following is NOT true?

A．The team followed the secretary’s advice.

B．If you want to see a sunrise, the east coast is a place to go to.

C．The camera team wasn’t able to film the scene the first day.

D．The director ordered his team to stop filming the “sunset”小题4:The director wanted to film a sunset over the ocean because _____.  

A．it went well with the separation of the hero and heroine

B．when they arrived at the beach it was already in the evening

C．it was more moving than a sunrise

D．the ocean looked more than a sunrise小题5:After the “sunset” began, the director suddenly put his face in his hands _____.

A．because he was moved to tears

B．as he saw everything in the film moving backwards

C．as the sunrise did not look as beautiful as he had imagined

D．because he was disappointed with the performance of the hero and the heroine

研究者在撰写社会工作研究报告时，要说明本研究使用方法的科学性和( )。

A．创新性

B．研究对象的基本情况

C．具有历史视角

D．研究意义

E．资料的可信程度

( )对承包单位在材料、半成品、构配件的存放、保管条件及时间等方面进行监控。

A．监理员

B．监理工程师

C．总监理工程师

D．质检员