下列各组物质中,能相互反应且反应类型属于复分解反应的是 [ ]
A. 氯化钠溶液和硝酸钾溶液
B. 氯化铁溶液和硝酸银溶液
C. 锌和稀盐酸
D. 二氧化碳通入澄清石灰水中
答案:B
计算(-3a3)2•(-2a2)3=______.
_____ we are sure about is the need to prevent children from being spoiled. [ ]
A. What
B. Which
C. Whether
D. That