任务一 单元测试

1、 问题:从营销的角度看待市场,市场是由人口、购买欲望和( )有机组成的总和。
选项:
A:供求
B:场所
C:购买力
D:需求
答案: 【
购买力
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第一章 单元测试

1、 问题:环境毒理学是研究环境物理性、化学性和生物性污染物,特别是环境化学性污染物对人类健康的毒性作用及其机理的科学。
选项:
A:对
B:错
答案: 【

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第一章 单元测试

1、 问题:下列各项中,尚未获得诺贝尔奖的是?( )
选项:
A:DNA双螺旋模型
B:核酶的发现
C:RNA干扰技术
D:抑癌基因的发现
答案: 【
抑癌基因的发现
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第一章 单元测试

1、 问题:A charge +Q is fixed in position as a small charge +q is brought near it and released from rest. Which best describes the magnitude of the velocity of the charge +q as r, the distance between the charges increases? ( )
选项:
A:The magnitude of the velocity will increase, and its rate of increase will also increase.
B:The magnitude of the velocity will increase, but its rate of increase will decrease.
C:The magnitude of the velocity will remain constant.
D:The magnitude of the velocity will decrease, and its rate of decrease will also decrease.
E:The magnitude of velocity will increase, but its rate of decrease will increase. 点我阅读全文