控制室布置要求屏正面最小尺寸为( )。 A.1800mm B.1500mm C 发布时间:2018-01-30 23:39 │ 来源:www.tikuol.com 题型:单项选择题 问题: 控制室布置要求屏正面最小尺寸为( )。A.1800mm B.1500mm C.1400mm D.1200mm
题型:单项选择题 如图所示,a图为一列简谐波在t=20s时的波形图,b图是这列波中p点的振动图线,那么该波的传播速度和传播方向是( )A.V=25cm/s,向左传播B.V=50cm/s,向工传播C.V=25cm/s,向右传播D.V=50cm/s,向右传播 查看答案
题型:单项选择题 To _____ good relationships with your teachers and classmates ,you should learn to share ups and downs with them.A.keep upB.add upC.bring upD.take up. 查看答案