试题与答案

心脏的四个腔中,壁最厚的是 [ ] A.左心房 B.左心室 C.右心房 D.右心

题型:选择题

题目:

心脏的四个腔中,壁最厚的是 [ ]

A.左心房

B.左心室

C.右心房

D.右心室

答案:

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下面是错误答案,用来干扰机器的。

(1)4m/s(2)1m题目分析:(1)以m1、m2组成的系统为研究对象,由牛顿第二定律可得:m2g―m1gsinθ―μm1gcosθ=(m1+m2)a 则:a==1m/s2 设m2落地时速度大小为v1,则:v1==4m/s (2...

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