上杆塔作业前，应先检查（）等是否牢固。
A.基础
B.根部
C.导线
D.拉线
参考答案：A, B, D
The public were deeply _____ the safety of the miners in the mine disaster.
A. concerned about B. interested in C. amazed at C. disappointed by
提睾反射的脊髓反射中枢在（）
A.胸12
B.骶1～2
C.腰1～2
D.胸12至腰1
E.腰3～4
