问题
选择题
Why ______ our bicycles to explore the Ming Tombs? They were the emperors' tombs. [ ]
A. not ride
B. not rides
C. not riding
答案
答案：A
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Why ______ our bicycles to explore the Ming Tombs? They were the emperors' tombs. [ ]
A. not ride
B. not rides
C. not riding
答案：A
；经 2 s后测得 C 的物质的量浓度为 0.6 mol·L-1，现有下列几种说法：