问题
选择题
He gave me a map, which proved to be of great ________ while I got round Beijing. [ ]
A. price
B. cost
C. value
D. charge
答案
答案：C
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He gave me a map, which proved to be of great ________ while I got round Beijing. [ ]
A. price
B. cost
C. value
D. charge
答案：C
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