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【单选题】
如果两个投资项目的期望值相同,但其概率分布不同,则( )
A.
标准差相同
B.
风险相同
C.
风险报酬相同
D.
风险不同
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【单选题】毒品有害人类健康,危害社会稳定。“摇头丸”是国家严令禁止的毒品之一,其化学式为C 9 H 13 N。有关该物质的下列说法中,不正确的是 [     ]
A.
组成物质各元素的质量比为9:13:1
B.
该物质的相对分子质量为135
C.
该物质是由三种元素组成的
D.
该物质是属于有机物
【单选题】听力原文:W: Won't you take the car? It's quite cheap. M I'm having second thoughts about buying the car. Q: What does the man mean? (15)
A.
He's not so sure to buy the car.
B.
He's ready to buy that car.
C.
He's certain to buy the car.
D.
He's afraid to buy that car.
【简答题】在客流量较大的区域,部分面食店为了减少顾客的就餐等待时间,会把面食的温度控制得恰到好处。某兴趣小组为了探究热水与冷水混合后的温度和哪些因素有关,将不同质量、不同温度的水在绝热容器中进行混合,并测出混合后的温度。实验结果记录如下表。 ( 1 )分析实验序号 1 与 2 与 4 的数据可知:当热水的温度 t 1 、冷水的温度 t 2 与冷水的质量 m 2 保持不变时,混合后的温度 t 随热水的质量 m...
【多选题】下列关于摇头丸的说法中,正确的是( )
A.
摇头丸的主要成分是MDMA,即亚甲基双氧甲基苯丙胺
B.
摇头丸一般为圆形、菱形、鱼形的药片状
C.
服用后出现长时间难以控制,随音乐剧烈摆动头部的现象
D.
摇头丸具有兴奋和致幻双重作用
【单选题】下列关于药物使用的说法中正确的是( )
A.
吃药期间喝茶无影响
B.
小明在路边买了一串羊肉串,吃完后拉肚子,应选抗生素止泻
C.
维生素C应在饭前服用
D.
摇头丸”可以使人神经兴奋,服用有助于保持旺盛精力
【多选题】选出数组a[11]的第一个元素和最后一个元素
A.
a[0]
B.
a[1]
C.
a[11]
D.
a[10]
【单选题】What's the biggest difference between the first and second green revolution in America?
A.
The first green revolution is to improve the food output while the second is not.
B.
The second green revolution is based on the theory of inserting genes while the first depends on that of crossbreeding.
C.
The technology that is used in the second green revolution has much more enormous potential than that of the first's.
D.
The second green revolution has caused harm to the environment while the first has not.
【简答题】A.what's more B.in the second place C.in addition D.on the other hand
【多选题】下列关于毒品危害的说法中,正确的是( )
A.
毒品的危害主要是个人危害、家庭危害和社会危害三个方面
B.
毒品的危害可以概括为 “ 毁灭自己、祸及家庭、危害社会 ”
C.
新型毒品如冰毒、麻古、摇头丸、 K 粉,危害不大
D.
毒品的危害性毋庸置疑,但不可否认一些毒品的药用价值
【单选题】What is the main idea of the second paragraph?
A.
What had happened during the boy's way to grandmother's house.
B.
Why he didn't want grandmother to know about why his body was bruised.
C.
How the boy was looking forward to that particular evening.
D.
The reasons why he was so curious about the life in the Renaissance.
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