楼梯段基础的做法有在楼梯段下设()等方式。
A.设砖基础
B.设石基础
C.设混凝土基础
D.设地梁
E.不设基础
参考答案:A, B, C, D
有效氧化钙与氧化镁含量是判定石灰质量的主要指标。
One of the real services of the historical novel is not that it can be a substitute for history, but tlat it can be a(n) extension.()
A. compliment
B. supplement
C. instrument
D. replacement