放映设备管理审批事项中包括影城设备易耗品/零配件购买，放映（）设备部件/配件等耗材采购。
参考答案：氙灯
设直线2x+3y+1=0和x2+y2-2x-3=0相交于点A、B，则弦AB的垂直平分线方程是（ ）。
I must leave for my home town tomorrow as my parents are ___ me to arrive on Sunday.
A．expecting
B．waiting
C．waiting for
D．expecting for
