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【简答题】
为什么人们购买债券和股票从个人来说可算是投资,但在经济学上不算是投资?
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】Chefs have a(n)_______ to get angry easily. (tend)
【简答题】假定有一种双绞线的衰减是0．7 dB／km(在1 kHz时)，若容许有20 dB的衰减，试问使用这种双绞线的链路的工作距离有多长，如果要使这种双绞线的工作距离增大到100公里，问应当使衰减降低到多少?
【简答题】结合自己的论文题目完成研究设计,包括 1)课题的研究目的 2)研究思路和具体的研究问题/研究假设,研究对象(取样地、取样方法、样本量), 3)研究方法(需要介绍可能采用的每一种研究方法的研究工具,研究工具的维度,每一维度包含的题项和内容,量表需要报告信度、效度指标,研究工具需要附在文末), 4)实施过程(收集研究资料的具体过程)
【单选题】听力原文：W: Mike said he can give us a ride to the game. M: Oh good, then he does have his car. What had the man assumed at first?
A.
Mike's friends didn't plan to go to the game.
B.
Alt of them couldn't ride in the woman's car.
C.
Mike had a car on his own.
【单选题】听力原文：W: Mike said he can give us a ride to the game． M: Oh good，then he does have his car． What had the man assumed at first?
A.
Mike's friends didn't plan to go to the game.
B.
All of them couldn't ride in the woman's car.
C.
Mike had a car on his own.
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