如图所示,在“用双缝干涉测光的波长”实验中,光具座上放置的光学元件依次为 ( )A.①光源、②滤光片、③单缝、④双缝、⑤遮光筒、⑥光屏B.①光源、②单缝、③滤光片、④双缝、⑤遮光筒、⑥光屏C.①光源、②滤光片、③双缝、④单缝、⑤遮光筒、⑥光屏D.①光源、②单缝、③双缝、④滤光片、⑤遮光筒、⑥光屏