. the cones secrete the pigment iodopsin and are most effective in bright light; they alone provide color vision. the rods, which secrete a substance called visual purple, or rhodopsin, provide vision in dim light or semidarkness; since rods do not provide color vision, objects in such light appear in...
price: - usd / sets port: qingdao/ tianjin/ shanghai condition new type tortilla production capacity % place of origin henan, china (mainland) contact now zhengzhou davo machinery co., ltd. country/region: china business type: trading company employee count: - people machine for ice cream cone/sugar cones...
needles / inflators ball carry net water bottles / carrier coaching resources referee set coaching boards whistle training vest / bibs mesh bibs nylon bibs netball bibs reflective vest activity play team band parachutes / jump sack bean bags tug rope juggling / dance bats / play ball fun & games bibs / cones...
needles / inflators ball carry net water bottles / carrier coaching resources referee set coaching boards whistle training vest / bibs mesh bibs nylon bibs netball bibs reflective vest activity play team band parachutes / jump sack bean bags tug rope juggling / dance bats / play ball fun & games bibs / cones...