题目内容 (请给出正确答案)
[主观题]

To us it seems so natural to put up an umbrella to keep the water off when it rains. But a

ctually the umbrella was not invented as protection against rain. It was first used as a shade against the sun.

Nobody knows who first invented it, but the umbrella was used in very ancient times. Probably the first to use it were the Chinese, way back in the eleventh century B.C..

We know that the umbrella was also used in ancient Egypt and Babylon as a sunshade. And there was a strange thing connected with its use; it became a symbol of honor and authority. In the Far East in ancient times, the umbrella was allowed to be used only by royal people or by those in high office.

In Europe, the Greeks were the first to use the umbrella as a sunshade. And the umbrella was in common use in ancient Greece. But it is believed that the first persons in Eu- rope to use the umbrellas as protection against the rain were the ancient Romans.

During the Middle Ages, the use of the umbrella practically disappeared. Then it appeared again in Italy in the 16th century. And again it became a symbol of power and author-ity.

Umbrellas have not changed much in style. during all this time, though they have become much lighter in weight. It wasn't until the twentieth century that women's um-brellas began to be made in a variety of colors.

The first use of umbrella was as______.

A.protection against rain

B.a shade against the sun

C.a symbol of power

D.a symbol of honor

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第1题

止喘灵口服液药物的提取采用()。

A.水提醇沉法

B.醇提水沉法

C.水蒸气蒸馏法

D.煎煮法

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第2题

止喘灵口服液药物的提取采用A.水提醇沉法B.醇提水沉法C.水蒸气蒸馏法D.乙醇回流法E.煎煮法

止喘灵口服液药物的提取采用

A.水提醇沉法

B.醇提水沉法

C.水蒸气蒸馏法

D.乙醇回流法

E.煎煮法

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第3题

玉屏风口服液药物的提取采用()。

A.水提醇沉法

B.醇提水沉法

C.水蒸气蒸馏法

D.乙醇回流法

E.煎煮法

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第4题

适用于提取醇溶性成分并能有效除去树脂、油脂等脂溶性杂质的方法是A.煎煮法B.盐析法C.水提醇沉法D

适用于提取醇溶性成分并能有效除去树脂、油脂等脂溶性杂质的方法是

A.煎煮法

B.盐析法

C.水提醇沉法

D.醇提水沉法

E.吸附澄清法

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第5题

适用于浸提对湿、热稳定的药材的方法是A.煎煮法B.盐析法C.水提醇沉法D.醇提水沉法E.吸附澄清法

适用于浸提对湿、热稳定的药材的方法是

A.煎煮法

B.盐析法

C.水提醇沉法

D.醇提水沉法

E.吸附澄清法

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第6题

适用于提取醇溶性成分并能有效除去树脂、油脂等脂溶性杂质的方法是()

A. 煎煮法

B. B.盐析法

C. C.水提醇沉法

D. D.醇提水沉法

E. E.吸附澄清法

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第7题

常用的浸出方法中不正确的是A、煎煮法B、浸渍法C、渗漉法D、醇提水沉法E、超临界提取法

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A、煎煮法

B、浸渍法

C、渗漉法

D、醇提水沉法

E、超临界提取法

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第8题

适用于浸提对湿、热稳定的药材的方法是()

A. 煎煮法

B. B.盐析法

C. C.水提醇沉法

D. D.醇提水沉法

E. E.吸附澄清法

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第9题

提取小分子游离香豆素的方法有

A.酸溶碱沉法

B.碱溶酸沉法

C.乙醚提取法

D.水煎煮法

E.水蒸气蒸馏法

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