在相同条件下,总质量为2g的CO和H2的混合气体,在O2中完全燃烧后全部通过足量的Na2O2固体,则固体质量增加[ ]
A.2g
B.1g
C.18 g
D.无法计算
答案:A
Alice _____ in a book that the city she lives in was _____ one hundred years ago.
A.found, found
B.founded, founded
C.founded, found
D.found, founded
执行下面的程序段后,B的值为()。A=300B=20A=A+BB=A-BA=A-B