【判断题】【(2)2】一个条形支撑板可以消除2个自由度;一个矩形支撑板可以消除3个自由度。
【判断题】不合格数图C-CHART属于计量型管制图。( )
【简答题】【光程】用在真空中波长为 λ 的单色光,在折射率为 n 的透明介质中从 A 沿某路径传播到 B ,若 AB 两点相位差为 5 π ,则此路径 AB 的光程为波长 λ 的 _________ 倍?
【单选题】有两个同方向的简谐振动,振动方程分别为:【图片】和【图片】,它们合振动的频率和拍频分别为
【简答题】A.He knew this beforehand. B.He judged from his common sense. C.He judged from the speeds of sound D.He judged by reading the textbook.
【多选题】毛泽东思想的活的灵魂,它们有三个基本方面,即
【单选题】He runs fast and plays football very well. He has a good _____. [ ]
【判断题】【(2)2】一个条形支撑板可以消除3个自由度。
【简答题】A.He knew this beforehand. B.He judged from his common sense. C.He judged from the speeds of sound D.He judged by reading the textbook.