用化学用语表示： （1）五氧化二磷 ______； （2）硫酸铵 ______；

下图为北美部分地区等气温年较差线分布图，读图回答1～3题。

1．影响②处等值线向南凸的主要因素是[ ]

A．纬度

B．季风

C．地形

D．河流

2．造成①、④两地气候差异的主要因素是[     ]

A．纬度

B．大气环流

C．洋流

D．地形

3．图中③、④两地的自然灾害主要有[ ]

A．地震

B．飓风

C．洪涝

D．寒潮

焦亚硫酸钠（）常用作食品漂白剂，其制备工艺流程如下：

已知：反应Ⅱ包含等多步反应。

（1）反应Ⅰ的化学方程式为____________，反应Ⅰ进行时应先通入__________气体。

（2）硫磺燃烧前先加热成液态并通过喷嘴喷入焚硫炉中，目的是__________。在上述工艺流程中可循环使用的物质是_____________。

（3）反应Ⅱ中需控制参加反应的气体与固体的物质的量之比接近____________，若气体量不足，则会导致_______________。

（4）与稀硫酸反应放出，其离子方程式为___________。

阅读理解。

     It's interesting that technology often works as a servant for us, yet frequently we become a servant to

it. Email is a useful tool but many feel controlled by this new tool. The average business person is getting

about 80 emails per day and many feel that about 80%of the messages in their in box are of little or no value.

     So, I have four suggestions to help you to become better at “Erasing Email”

     1.get off the lists. The best way to deal with a problem is to never have it. If you are receiving a lot of

unwanted emails, ask to be removed from the various lists. This would include your inclusion in unwanted

lists.

     2. “unlisted address”. Just as you keep an unlisted telephone number that you share only with those

whom you want to have direct access to , you might want to get a separate email address only for the

important communications you wish to receive.

     3.check it once or twice per day. Many I speak with are becoming chained to their email server,

monitoring incoming email continuously. Maybe this is because email creates its own sense of urgency, but

most of the communications are not all that urgent. I respond to them a couple of times per day.

     4. deal with it. As you open each email, do one of the following:

     a. if it requires a quick response, respond to it and delete it.

     b. if it requires a response but is not the best use of your time, try to find someone else to do it.

     c. if it is going to take any serious amount of time to respond, schedule it for action in your day planner

and then download the message, save it, or print it out for future action.

     I personally receive about 250 emails per day and by practising the suggestions above, I can handle that

volume in about an hour, taking advantage of this fantastic tool but not being controlled by it to make sure

I'm doing more important tasks in my day.

1. if you get unwanted emails, the best you can do is to _____.

A. make a list of them

B. put them into unwanted lists

C. send them to a special address

D. ask to be deleted from different lists

2. For the important communications, the writer suggests that you ______.

A. have a direct access for them

B. have several email servers for them

C. get a separate email address for them

D. get an unlisted phone number for them

3. To avoid being chained by the coming emails, what you can do is to ______.

A. respond urgent ones only

B. reply to all of them at the same time

C. handle them a couple of times daily

D. keep replying to emails all day long

4. To deal with an email you get, you can do the following except ______.

A. responding right away if it's urgent

B. downloading every email before you reply

C. scheduling it for later reply if it takes much time

D. asking someone else to reply to it if it's not at your convenience

光缆布线工程结束后进行测试是工程验收的关键环节。以下指标中不属于光缆系统的测试指标的是（）。

A.最大衰减限值

B.回波损耗限值

C.近端串扰

D.波长窗口参数

在项目阶段中不确定因素最高的是（）。

A.启动

B.计划

C.执行

D.收尾