问题 单项选择题

某变配电间(所处地区大气压为101325Pa)的余热量为40.4kW,通风室外计算温度为32℃,计算相对湿度为70%,要求室内温度不超过40℃,则机械通风系统排除余热的最小风量应是______kg/h。

A.13000~14000
B.14500~15500
C.16000~17000
D.17500~18500

答案

参考答案:D

材料分析题

一天晚上,某校八年级学生李某在回家路上遇到三名不法少年的拦截。他们向李某勒索了20.6元钱和一块手表,并将其打伤。于是李某第二天邀集好友找到了三名少年,对他们进行了殴打并索回了自己的钱物。

(1)三名少年是什么行为?为什么?

                                                                                                                                                            

(2)李某索回自己财物的方式是否正确?为什么?

                                                                                                                                                             

                                                                                                                                                            

(3)如果你是李某的好友,你会怎样做?

                                                                                                                                                            

多项选择题