题目内容 (请给出正确答案)
[主观题]

A characteristic of American culture that has become almost a tradition is to respect the

self-made man—the man who has risen to the top through his own efforts, usually beginning by working with his hands. While the leader in business or industry or the college professor occupies a higher social position and commands greater respect in the community than the common laborer or even the skilled factory worker, he may take pains to point out that his father started life in America as a farmer or laborer of some sort. This attitude toward manual (体力的)labor is now still seen in many aspects of American life.

One is invited to dinner at a home that is not only comfortably but even luxuriousl(豪华地)furnished and in which there is every evidence of the fact that the family has been able to afford foreign travel, expensive hobbies, and college education for the children; yet the hostess probably will cook the dinner herself, will serve it herself and will wash dishes afterward, furthermore the dinner will not consist merely of something quickly and easily assembled from contents of various cans and a cake or a pie bought at the nearby bakery. On the contrary, the hostess usually takes pride in careful preparation of special dishes. A professional man may talk about washing the car, digging in his flowerbeds, painting the house. His wife may even help with these things, just as he often helps her with the dishwashing. The son who is away at college may wait on table and wash dishes for his living, or during the summer he may work with a construction gang on a highway in order to pay for his education.

From paragraph 1, we can know that in America______.

A.people tend to have a high opinion of the self-made man

B.people can always rise to the top through their own efforts

C.college professors win great respect from common workers

D.people feel painful to mention their fathers as labors

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第1题

过滤和()是沉淀重量法的最主要操作。A.称量B.洗涤C.干燥D.灼烧

过滤和()是沉淀重量法的最主要操作。

A.称量

B.洗涤

C.干燥

D.灼烧

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第2题

在沉淀法的基本操作中,过滤的目的是(),洗涤的目的是洗去沉淀吸附的杂质和混杂在沉淀中的母液、烘干或灼烧的目的是除去洗涤后沉淀中的水分和洗涤液中的挥发性物质,并使沉淀()。
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第3题

在沉淀法的基本操作中,过滤的目的是(),洗涤的目的是洗去沉淀吸附的杂质和混杂在沉淀中的母液、烘干或灼烧的目的是除去洗涤后沉淀中的水分和洗涤液中的挥发性物质,并使沉淀()
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第4题

过滤和离心主要分离不可溶性的固体和液体,沉淀主要是是可溶性的物质沉淀出来,沉淀之后还需要进行固液分离,也就是离心或者过滤分离才能将沉淀和母液分开。
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第5题

为了保证沉淀分离完全,重量分析对沉淀形的要求()。

A、溶解度越小越好

B、沉淀纯度要高

C、易于过滤和洗涤

D、易于干燥

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第6题

为了保证沉淀分离完全,重量分析对沉淀形的要求为()。

A、溶解度越小越好

B、沉淀纯度要高

C、易于过滤和洗涤

D、易于干燥

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第7题

()过程是通过向水中投加药剂使胶体物质脱稳并聚集成较大的颗粒,以使在后续的沉淀过程中分离或在过滤过程中被截除。

A.过滤

B.混凝

C.沉淀

D.澄清

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第8题

洗涤沉淀是为了清除表面所吸附的杂质和母液,可以多次洗涤。()

洗涤沉淀是为了清除表面所吸附的杂质和母液,可以多次洗涤。()

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第9题

沉淀生成后,采用过滤的办法使沉淀和母液分开后,需用烘干和灼烧的方法除去沉淀中的(),使沉淀转化
成组成固定的称量形式。

A.杂质

B.杂质和可挥发的物质

C.水分和可挥发的物质

D.水分和杂质

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