下列有关化学用语正确的是 [ ]
A.CO2的电子式
B.Cl-的结构示意图
C.NH3分子比例模型
D.质量数为37的氯原子
答案:B
有硝酸铜、氯化钠、石灰水、盐酸、碳酸钾五种溶液,从中取若干种进行混合,若使混合时既无气体也无沉淀生成得到澄清溶液,最多能取溶液( )
A.5种
B.4种
C.3种
D.2种
Lack government support, they had to approach sponsors, organizers, and musicians on their own—at first, she claims, in her country.
A.Lacks
B.Lacked
C.Lacking
D.A lack of