试题与答案

一条轻绳最多能拉着质量为3m的物体以加速度a匀加速下降;它又最多能拉着质量为m的

题型:问答题

题目:

一条轻绳最多能拉着质量为3m的物体以加速度a匀加速下降;它又最多能拉着质量为m的物体以加速度a匀减速下降,绳子则最多能拉着质量为多大的物体匀速上升?

 

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:MPC=b,所以APC>MPC。平均消费倾向总是大于边际消费倾向的,但随着收入的增加,二者越来越接近。

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题型:单项选择题

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I never felt so (20) as I did that day.

二、完形填空

A.day

B.chance

C.cheque

D.tree

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题型:选择题

中国古代王朝的后宫中有“母以子贵”与“子以母贵”两种现象:前者是母亲因儿子地位尊贵而显贵,后者则是儿子因母亲受宠而地位显贵。导致这两者不同的根本原因是(   )                                                                 

A.妇女的社会地位在不同的朝代高低有别

B.重男轻女的观念在不同的时期轻重不同

C.嫡长子继承制在不同的王朝取舍不一

D.皇帝 个人的倾向有所变化

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