My uncle knew little about the famous film Queen he saw it yesterday evening.
A:if
B:and
C:until
D:because
①在____℃时,氯化钠与硝酸钾的溶解度相等.
②在t2℃时,能配成硝酸钾溶液的最大溶质质量分数为____.(结果保留小数点后一位)
“塑料”是人类利用科学技术创造出来的新的物质,它诞生于( )