问题 单项选择题

( )是指在合同中约定,具有购买货物要求和支付货物价款能力的当事人以及取得该当事人资格的合法继承人。

A.供货人

B.购货人

C.出卖人

D.承包人

答案

参考答案:B

问答题

学好化学能使我们更好地认识生活中各种现象,能够合理地解决实际问题,用你学过的化学知识回答下列问题。

化学与水

(1)自然界中的水都不是纯水,净水时需加入明矾的目的是                        

(2)欲除去水中不溶性杂质,需进行过滤操作,该操作过程中玻璃棒所起的作用是      

(3)某些地方的饮用水中含有少量的Ca(HCO3)2等可溶性盐。烧水时,Ca(HCO3)2发生分解反应,生成难溶性的CaCO3。试写出Ca(HCO3)2受热分解的化学方程式               

                                      (2分)。

(4)节约水资源,防止水污染是每个公民应尽的责任和义务。下列做法会造成水体污染的有(填序号)         。

A.工业废水直接排放

B.工业废气处理后排放

C.禁止使用含磷洗衣粉

D.大量使用化肥、农药化学与金属。

(1)地壳中含量最高的金属元素是           

(2)为了全民的健康,我国推广使用强化铁酱油,这里的“铁”指的是________。(填“单质”、“元素”或“原子”)。

(3)校园内铁制车棚生锈实质是铁与空气中的            发生化学反应,写出一种防止其生锈的一种方法________________________________________。

(4)铁路上铺接钢轨常利用铝热反应:2Al + Fe2O3  高温  2Fe + Al2O3,该反应说明铝的活动性比铁     (填“强”或“弱”);黄金是一种贵重金属,各种黄金首饰易于保存的主要原因是                  

化学与计算

右图是超市销售的一种加碘盐标签上的部分文字说明。

回答下列问题:                                              

(1)每袋该食盐中碘元素的质量       mg。

(2)中国营养学会推荐:一个18岁的青年每天摄入碘元素的质量为0.15mg。假设碘的来源仅靠这种加碘食盐,该青年每天摄入这种食盐应为     g。

单项选择题

The conception of God and nature and of the relation of man to both provided the 18th- century philosophers with their faith in the worth and dignity of the individual man and the efficacy of human reason. The 18th century was the moment in history when men experienced the first flush and freshness of the idea that man is master of his own fate; the moment in history, also, when this emancipating idea, not yet brought to the harsh test of experience, could be accepted with unclouded optimism.
Never had the nature seemed less mysterious, more simply constructed, more open and visible and eager to yield its secrets to common-sense questions. Never had the nature of man seemed less perverse, or the intelligence and will of men more pliable (yielding) to rational persuasion. Never had social and political evils seemed so wholly the result of ignorance and superstition, or so easily corrected by the spread of knowledge and the construction of social institutions on a rational plan.
The first task of political science was to discover the natural rights of man, the second to devise the form of government best suited to secure them. And for accomplishing this high task, for creating and maintaining a society founded on justice and equality, the essential freedom was freedom of the mind.

In the next paragraph(not reproduced here), the author will most probably write on ______ .

A.development of medical equipment for hospitals

B.meticulous plans on establishment of ideal governments

C.surgery experts that help to cure mental diseases

D.philosophers whose works liberate human minds