车轮踏面缺损相对轮缘外侧至缺损部位边缘之间距离不小于（）。
A、1505mm
B、1508mm
C、1353mm
D、1435mm
参考答案：B
设集合A={ x|0＜x≤3 }，B={x|x≤0}，则A∪B=（ ）
A．{x|0＜x≤3}
B．{0}
C．{x|x≤3}
D．R
Why don't you bring _____ to his attention that you are too busy to do it? [ ]
A. this
B. that
C. what
D. it
