I'm sorry I'm late. The ____ is, the traffic is very busy at the moment.
如图所示,小球在轻弹簧和水平轻绳的拉力作用下处于静止状态.弹簧与竖直方向的夹角θ=37°,弹簧的拉力F=10N,伸长量为△x=0.01m,sin37°=0.6,cos37°=0.8.
实验室制取少量溴乙烷的装置如图所示(已知溴乙烷的沸点为384℃).根据题意完成下列填空: