水的沉淀法处理的基本原理是什么?试分析球形颗粒的静水自由沉降(或上浮)的基本规律,影

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问题:

水的沉淀法处理的基本原理是什么?试分析球形颗粒的静水自由沉降(或上浮)的基本规律,影响沉降或上浮的因素是什么?

考点:水污染控制工程水污染控制工程题库
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In the United States, it is not usual to telephone someone early in the morning. If you telephone early in the day, while he is shaving or having breakfast, the time of the call shows that the matter is very important and requires immediate(立即的) attention. So it is with the telephone calls made after 11:00 pm. If someone receives a call during sleeping hours, he may think that it’s a matter of life and death. The time chosen for the call communicates its importance.

In social life, time plays a very important part. In the USA guests are likely to feel they are not highly regarded if the invitation to a dinner party reaches them only three or four days before the party date. But it is not true in all countries. In other areas of the world, it may be thought silly to make an appointment(约会) too far ahead because plans which are made for a date more than a week away may be forgotten. The meaning of time is not the same in different cultures that treat time differently; being on time is valued highly in American life, for example. If people are not on time, they may be regarded as impolite or not fully responsible(责任). In the USA no one would think of keeping a business friend for an hour; it would be too impolite. A person who is 5 minutes late is asked to make a shout apology (道歉). If he is less than 5 minutes late, he will say a few words of explanation(解释), though perhaps he will not complete the sentence.

小题1:A call at midnight would mean_________.

A.the matter is less important

B.the matter is too difficult to handle

C.the matter requires immediate attention

D.it is a matter of life and death小题2:According to the passage, time plays a very important part in__________.

A.everyday life

B.personal life

C.getting along with others

D.business小题3:In the passage, the writer suggests that invitation cards should be sent___________.

A.three or four days before the party date in all cultures

B.three or four days before the party date in some cultures

C.three or four days before the party date in the USA

D.at your chosen time

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继电器铁芯故障通常是通电后衔铁()。

A、无法打开

B、不能动作

C、动作过缓

D、无法吸合

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为了解决ATM与以太网的连接,可采取( )。

A.在ATM交换机内部单独定义以太网帧格式

B.改变删交换机的传输速率,使之与以太网传输率一致

C.将ATM的信元格式通过路由器转换为以太网数据帧格式

D.在ATM交换机中增设以太网端口模块

题型:问答题 简答题

关于外科感染,下列叙述哪项不正确()

A.疖是指一个毛囊及其皮脂腺的化脓性感染

B.痈是指邻近多个不同部位散在的毛囊及其皮脂腺的化脓感染

C.急性蜂窝织炎是皮下筋膜下蜂窝组织的化脓性感染

D.甲沟炎是指甲沟及其周围组织的急性感染

E.脓性指头炎是指手指末节掌面皮下组织化脓性感染

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厨房设备发生故障要立即进行(),使设备尽快恢复正常状态。

A、教育

B、调查

C、检修

D、停电

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