题干
Let's wait and see whether books by the Internet in the future.
A：replace
B：replaced
C：will be replaced
D：were replaced
答案(点此获取答案解析）
C
Let's wait and see whether books by the Internet in the future.
A：replace
B：replaced
C：will be replaced
D：were replaced
CO2+H2，达平衡后测得CO2为0.75 mol再通入6 mol水蒸气，达到新的平衡后，CO2和H2的物质的量之和可能为