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【多选题】
GB8408-2008《游乐设施安全规范》规定：重要焊缝：是指直接涉及到人身安全的焊缝，如：( )
A.
乘坐物支撑件焊缝、升降油缸(气缸)上下支撑件焊缝
B.
乘坐物吊挂点支撑件焊缝
C.
轨道对接焊缝
D.
车辆连接器焊缝、吊厢框架焊缝等。
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调查方法大致可分为区间观测、地点观测和行驶试验三个方面
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交通量是指单位时间内通过道路某一断面的车辆数,通常以一天或一小时为时间单位
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Ⅰ＋Ⅱ＋Ⅳ＋Ⅵ
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Ⅰ＋Ⅱ＋Ⅲ＋Ⅴ
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Ⅲ＋Ⅳ＋Ⅴ＋Ⅵ
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【简答题】将下列各式因式分 （1）4x 2 -16； （2）（a 2 +b 2 ） 2 -4a 2 b 2 ．
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B.
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