题型：填空题 直线l经过两条直线2x-y=5和3x+2y=4的交点，且和点（3，2）的距离等于5，那么l的方程是（ ）A．2x-y+1=0B．2x+y-3=0C．2x+y-3=0或x-2y-4=0D．2x-y+1=0或x-2y-4=0 查看答案
题型：填空题 Even though the main source of ______ exposure for a majority of the human population is the sun, the artificial tanning from sun beds contributes significantly to the total UV risk.A．extra violentB．extra violetC．ultravioletD．ultravirus 查看答案