碱金属原子的价原子具有两种能态.The valence atom of an alkali - metal atom has two states.所有的碱金属都在闭合壳层之外有一单个S电子.All the alkali metals have a single s - electron outside a closed shell.当碱金属光谱显示出不容怀疑的双线结构时,是令人惊奇的.It was surprising when th...
It's not naturaI to taIk into a pIastic gizmo to someone you can't even see!对着个塑料玩意和你看不见的人说话很不自然!That gizmo there is actually the key to move forward.那个小东西实际上是继续前进的钥匙.What is this silly little gizmo on the bott...