以双缝干涉实验中,波长为λ的单色平行光垂直入射到缝间距为a的双缝上,屏到双缝的距离为D,则某一条明纹与其相邻的一条暗纹的间距为:()
A.A
B.B
C.C
D.D
参考答案:B
解析:
— Do you know ______ buy the book Harry Potter?
— The book is _____ popular that you can buy it at any bookshop. [ ]
A. where can I, so
B. where can I, such
C. where I can, so
D. where I can, such
备用氧压机启动前的准备工作有哪些?