在基坑开挖过程中应掌握好()要求。
A、分层、对称、平衡、限时
B、分层、分步、对称、平衡
C、分层、分步、对称、平衡、限时
D、分步、对称、平衡、限时
参考答案:C
如果-50表示支出50元,则+100元表示______.
Our Chinese teacher is very kind to us. So we all regard her _____ our best friend. [ ]
A. by
B. as
C. for
D. with