DNA分子中所含的碱基是______ A．GCTU B．GACT C．AGC

发布时间：2019-05-27 22:16 │ 来源：www.tikuol.com

题型：单项选择题

问题：

DNA分子中所含的碱基是______

A．GCTU B．GACT
C．AGCU D．GATU
E．TCAU

考点：医疗卫生系统招聘考试医学基础知识医疗卫生系统招聘考试医学基础知识

题型：单项选择题

请你根据下列要求帮助王海对该销售业绩报表进行整理和分析：

利用“条件格式”功能进行下列设置：
将第一季度和第二季度中低于500的“销售量”所在的单元格以一种文本颜色表示，其他两季度中高于900的“销售量”用另一种文本颜色表示。

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题型：单项选择题

矩形各角平分线围成的四边形是[ ]

A. 平行四边形

B. 正方形

C. 矩形

D. 菱形

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题型：单项选择题

选用下列短语并用其正确形式填空。

learn from, give up, take place, at times, a couple of, as for, divide…into,
even though, as a result, for example, cut down, die out, in public

1. The traffic accident ________ when they were passing the corner of the street.
2. He won't leave the TV set _________ supper's on the table.
3. Hong Zhanhui is really a kind ma, we should _____him.
4. There are too many students here, so I ____ them ____ six groups.
5. The doctor told him that he may take some fruits, ________ apples, bananas and oranges.
6. We are going to _______ those trees, because they made the vegetables stop growing.
7. Many animals are nearly ______, so we should protect them.
8. Li Dong doesn't like to speak __________.
9. He said he would __________ the chance to study abroad.
10. They usually have lunch at a restaurant, but they have their lunch at home __________.

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题型：单项选择题

胃酸的生理作用有

A、杀菌

B、使蛋白质变性

C、激活胃蛋白酶原

D、促进钙铁的吸收

E、促进胰液、小肠液和胆汁分泌

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题型：单项选择题

如图所示，理想变压器原副线圈匝数之比为4：1，原线圈接入一电压为u=220_{sin100πtV的交流电源，副线圈接一个R=27.5Ω的负载电阻．则下述结论正确的是（　　）}

A．副线圈中电压表的读数为55V

B．副线圈中输出交流电的周期为0.01s

C．原线圈中电流表的读数为0.5A

D．原线圈中的输入功率为110W

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