小型V形铁一般用中碳钢经（）加工后淬火磨削而成。
A.刨削
B.车削
C.铣削
D.钻削
参考答案：A
— Hainan Island is the ______ largest island in China.
— Yes, and the weather there is nice. So every year ______ people come here to enjoy themselves. [ ]
A. two; thousand of
B. second; thousand of
C. two; thousands of
D. second; thousands of
按照《建设工程质量管理条例》，屋面防水工程、有防水要求的卫生间、房间和外墙面的防渗漏，其最低保修期限为( )年。
A．1
B．2
C．3
D．5
