A.一直不熄滅 B.立即熄滅 C.慢慢地熄滅 D.在開(kāi)關(guān)拉開(kāi)瞬間更亮一些,然后慢慢地熄滅
A.1/2 B.1/3 C.1/4 D.1/5
A.100~200mm B.200~300mm C.300~500mm D.500~600mm