— How's the weather today? — It's ______ 发布时间:2017-04-18 00:29 │ 来源:www.tikuol.com 题型:选择题 问题: — How's the weather today? — It's ___________. [ ]A. rainyB. rainC. raining
题型:选择题 把质量是270g的铝块挂在弹簧秤的挂钩下面,并把铝块浸没在水中,问:(1)铝块受到的浮力多大?(2)弹簧秤的示数是多大?(铝的密度是2.7×103kg/m3,g=10N/kg). 查看答案