【判断题】警冲标用来指示机车车辆的停留位置,防止机车车辆侧面冲突。设在两会合线路间距离为4m的地方,当中间距离不足4m时,设在两线路中心线最大间距的起点处。
【判断题】极性溶剂一般使π→π*吸收带发生红移,使n→π*吸收带发生蓝移。
【单选题】听力原文:M: Good morning. W: Good morning. How can I help you? M: I understand that the school organizes...umm, trips to different... W: Yes, we run five every month: three during weekends and two Wednesd...
【单选题】What is the possible meaning of the word 'deterioration' in the last paragraph?
A.
worsening of general situation
B.
lowering of moral standards
C.
declining of physical constitution
D.
spreading of evil conduct
【单选题】(单选)楼梯的坡度是指楼梯段的坡度,即楼梯段的倾斜角度。楼梯踏步的高宽比可以确定( )
【判断题】极性溶剂一般π→π * 吸收带发生红移,使n→π * 吸收带发生蓝移。 ( )
【判断题】极性溶剂一般使π→π*吸收带发生红移,使n→π*吸收带发生蓝移
【单选题】警冲标设在两会合线路线间距离为_______的中间,用来指示机车车辆的停留位置,防止机车车辆的侧面冲撞。