下列物体处于平衡状态的是[ ] A.做简谐振动的弹簧振子 B.做匀速圆周运动的小 发布时间:2017-07-14 02:26 │ 来源:www.tikuol.com 题型:选择题 问题: 下列物体处于平衡状态的是[ ]A.做简谐振动的弹簧振子 B.做匀速圆周运动的小球 C.做匀速转动的CD光盘 D.空间站里处于漂浮的宇航员
题型:选择题 A certain shade of gray paint is obtained by mixing 3 parts of white paint with 5 parts of black paint. If 2 gallons of the mixture is needed and the individual colors can be purchased only in one-gallon or half gallon cans, what is the least amount of paint, in gallons, that must be purchased in order to measure out the portions needed for the mixture ?()A.AB.BC.CD.DE.E 查看答案