弹簧钢按用途分属（）。
A．建筑及工程用钢
B．结构钢
C．工具钢
D．电工用钢
参考答案：B
Every student and every teacher _______. [ ]
A. are going to attend the meeting
B. have attended the meeting
C. has attended the meeting
D. is attended the meeting
信仰经典的证据何在？
