Millie has black cat in her home. cat likes playing with her every evening.
A:a: A
B:the; The
C:a: The
D:the: A
江南水乡以河成街,街桥相连。读江南水乡景观图,回答问题。
请运用所学地理知识分析上述景观的形成原因。
请用下列仪器和药品组成一套由含有硫化钙杂质的电石进行乙炔气体的制备、净化、检验,并可通过计算确定乙炔产率的系列实验装置,溴水的浓度为0.1mol/L,体积是20mL,NaOH溶液足量.
读图,完成下题