配制50g溶质质量分数为15%的氯化钠溶液的实验过程中不需要用到的仪器是( )
A:
B:
C:
D:
The first question is as as the second one. I can answer them easily.
读图,回答
下列农业生产的做法符合因地制宜、可持续发展的是( )
读某市交通旅游图,完成下列各题: