在底部开有小孩脚可以进入的水上充气玩具，幼儿一只脚进入孔的圆周应为（）以上。
A.30cm
B.32cm
C.34cm
D.35cm
参考答案：D
What do foreign correspondents do to get more information().
A.They discuss with local reporters.
B.They interview eyewitnesses.
C.They talk to local officials.
D.They read more local newspapers or magazines.
常用构件代号，如屋架用WJ为代号。( )
