溶剂比对芳烃回收率有什么影响？

没有金属，生活是难以想象的．请你根据所学知识回答下列问题：

（1）只要观察一下你的周围，你就能理解金属是多么有用．在一百余种元素中，由于金属具有特殊的组成和结构，决定了金属具有优良的物理性能．你认为金属比较重要的两种物理性质是______，______．

现代社会以各种金属为支撑，其中用量最大、应用最广泛的金属是______．地壳中含量最丰富的金属是______．

（2）我国早在春秋战国时期就开始炼铁、应用金属铁．请你用化学方程式表示用一氧化碳还原氧化铁的化学反应原理______．

（3）铝比铁更易与氧气反应，然而我们生活中的铝制品却比铁制品更不易锈蚀，是因为______．

某患者，男，68岁。喘咳短气，痰多稀白，胸膈满闷，腰痛脚软，双下肢略有水肿，舌苔白滑，脉弦滑。治宜选用（）

A.肾气丸

B.二陈汤

C.定喘汤

D.小青龙汤

E.苏子降气汤

A good modern newspaper is an extraordinary piece of reading. It is remarkable first for what it contains the range of news from local crime to international politics, from sports to business to fashion to science, and the range of comment and special features (特定) as well, from editorial page to feature articles and interviews to criticism of books, art, theatre and music. A newspaper is even more remarkable for the way one reads it never completely, never straight through, but always by jumping from here to there, in and out glancing at one piece, reading another article all the way through, reading just a few paragraphs of the next.

A good modern newspaper offers a variety to attract many different readers, but far more than any one reader is interested in. What brings this variety together in one place is its topicality (时事性), its immediate relation to what is happening in your world and your locality now. But immediacy and the speed of production that goes with it mean also that much of what appears in a newspaper has no more than transient (短暂的) value.

For all these reasons, no two people really read the same paper: what each person does is to put together out of the pages of that day’s paper, his own selection and sequence, his own news paper. For all these reasons, reading newspapers efficiently, which means getting what you want from them without missing things you need but without wasting time, demands skill and self-awareness as you modify and apply the techniques of reading.

A modem newspaper is remarkable for all the following except its ().

A. wide coverage

B. uniform style

C. speed in reporting news

D. popularity

税务所虽然不是税务行政处罚的主体，但其可以对个体工商户及未取得营业执照的单位、个人实施罚款额在2000元以下的税务行政处罚。( )

硝镁加热器正常液位控制高度为（）。

A.超过热列管管束100~200mm

B.超过热列管管束200~300mm

C.低于加热列管管束

D.与列管管束持平