如图所示,长为5米的细绳的两端分别系于竖立在地面上相距为4米的两杆顶端A、B。绳 发布时间:2017-07-07 21:40 │ 来源:www.tikuol.com 题型:填空题 问题: 如图所示,长为5米的细绳的两端分别系于竖立在地面上相距为4米的两杆顶端A、B。绳上挂一个光滑的轻质挂钩。它钩着一个重为12牛的物体。平衡时,绳中张力T=_____________。
题型:填空题 如果文丘里温度增高到95℃,就必须通过下面其中一个或所有方法增加焙烧炉下游的气体流量降温()。A.部分打开一个喷枪端盖或打开管道阀门B.增加燃烧空气量C.增加焙烧炉压力设置PIC-120D.加大喷洒量 查看答案
题型:填空题 A certain grocery purchased x pounds of produce for p dollars per pound. If y pounds of the produce had to be discarded due to spoilage and the grocery sold the rest for s dollars per pound, which of the following represents the gross profit on the sale of the produceA.(x-y)s-xpB.(x-y)p-ysC.(s-p)y-xpD.xp-ysE.(E) (x-y)(s-p) 查看答案