— lives. We hope there won't be wars any more.
A:Germany; Two million
B:Germans; Millions of
C:German; Two million of
D:Germans; Million
欲测定某生石灰中碳酸钙的质量分数,进行了如图实验.请计算:
若i为虚数单位,则1+i1-i等于 ( )