【化】 表面皿

蘸取几滴您所分配到的标准溶液，将其放在一个干净的观察玻璃上，然后将观察玻璃放在尽可能靠近火炉底部的空气入口处。

watch-glass

watch bottom, watch cover

watch over sb

watch

watch or clock time indicating

watch-glass

watch or clock acoustic means

watch television