为了保证储罐内各种成分的(),需要不定期地进行倒罐,即把LNG从一个储罐倒向另一个储罐。
A、活跃性
B、稳定性
C、均匀性
D、准确性
参考答案:C
时期是人生学习和发展的宝贵阶段。
He ____ they didn't start early they wouldn't catch the first bus. [ ]
A. said that if
B. asked if
C. asked whether
D. said that whether