单头螺纹管箍
参考答案：
一端有螺纹的管箍。
_________ to come earlier next time?[ ]
A. Would you mind
B. Would you like
C. Could you please
D. Could you mind
公共建筑的疏散走道和楼梯的最小宽度不应小于( )m。
A．1.0 B．1.1 C．1.2 D．1.4
