题干
32．_____from lightweight materials，the robots are about the size of a human arm or
smaller．
A：To build
B：Being built
C：Having built
D：Built
答案(点此获取答案解析）
D
A：To build
B：Being built
C：Having built
D：Built
量的Mg、Cu组成的混合物投入适量稀硝酸中，固体恰好完全溶解时收集到标准状况下0.896LNO气体，向反应后溶液中加入2mol/L NaOH溶液70mL时金属离子恰好沉淀完全。则整个过程消耗的硝酸的物质的量为 （ ）