A:does the boss come will it
B:the boss comes will it
C:has the boss come it will
D:the boss comes it will
①液氯 ② ③白磷 ④18O ⑤ ⑥红磷 ⑦16O ⑧氯气.
视觉让你能够看到周围的事物,感知美好的世界,人的视觉的形成于( )