【简答题】用l=600 nm的单色光垂直照射牛顿环装置时,从中央向外数第4个(不计中央暗斑)暗环对应的空气膜厚度为_______________________mm.(1 nm=10-9m)
【单选题】The child broke the window, but it was his parent's___for letting him play football indoors.
【多选题】任何一款香精,按照香料在其中的作用,均包括()
【简答题】用波长为 600nm 的单色光垂直照射空气中的牛顿环装置时,第3级暗环对应的空气膜厚度为 ______ nm 。
【单选题】The child broke the window, but it was his parents'___for lettting him play football indoors.