螺纹的最小直径又叫螺纹的公称直径。
参考答案：错
I wonder ____ that got the idea of publishing the Guinness Book of World Records. [ ]
A. who was it
B. who it was
C. it was who
D. whom he was
平屋顶主要由（）组成。
A.屋面
B.承重结构
C.顶棚
D.保温隔热层
E.结合层
