多项选择题

请问下列属于心理风险因素的事例有
A、酒后驾车
B、躺在床上吸烟
C、下班时未关闭电源
D、仓库中堆放了易燃物品

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单项选择题

下列不是实体型间联系的种类有（   ）。
A、1：n
B、1：1
C、m：n
D、2：1

单项选择题

4) A filament running along the axis from the origin to x = 80.0 cm carries electric charge with uniform density. At the point with coordinates ( x= 80.0 cm, y = 80.0 cm), this filament creates electric potential 100 V. Now we add another filament along the y axis, running from the origin to y = 80.0 cm, carrying the same amount of charge with the same uniform density. At the same point P, is the electric potential created by the pair of filaments

A．greater than 200 V
B．200V
C．100V
D．between 0 and 200 V
E．0