主纳气的是()
A.肝
B.心
C.脾
D.肺
E.肾
参考答案:E
It _______ long before we ______ the result of the experiment.
A.will not be; will know
B.is; will know
C.will not be; know
D.is; know
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