问题
单项选择题
从植物药材浓缩醇提取液中除去树脂、叶绿素等水不溶性杂质的方法为( )
A．水提醇沉法
B．醇提水沉法
C．醇提醚沉法
D．铅盐沉淀法
E．酸提碱沉法
答案
参考答案：B
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从植物药材浓缩醇提取液中除去树脂、叶绿素等水不溶性杂质的方法为( )
A．水提醇沉法
B．醇提水沉法
C．醇提醚沉法
D．铅盐沉淀法
E．酸提碱沉法
参考答案：B
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2. I have two pens. One is red, _______ is black. 3. There are only five students in the classroom. What are _______? 4. There are a lot of people in the park. Some are walking, some are looking at the flowers, some are boating, _______ are running. 5. The jacket is too small for me. Would you show me _______ one?
7. The test is so difficult that _______ of us can understand it.
9. There are lots of trees on _______ sides of the river. 10. I have several friends here, but ______ of them has come to see me. 11. —Which of the two dictionaries do you like better? —I like _______, because they're not useful.
—Yes, I have got ________ to tell you. 13. Don't worry. There's ________ much wrong with you. 14. We'll do ________ possible to support(支撑) you. |