A:discount
B:belief
C:curiosity
D:satisfaction
某粗盐溶液中含有少量的CaCl2、MgCl2、Na2SO4和泥沙,进行以下操作可将杂质除去,(1)过滤;(2)加适量盐酸;(3)加过量的氢氧化钠溶液;(4)加过量碳酸钠溶液;(5)加适量氯化钡溶液;正确操作顺序是( )
关于经线和纬线的正确叙述( )
—Guang'an is a beautiful city, isn't it?
—Yes. There are about two _______ visitors here every week.