【单选题】设过点P(x,y)的直线分别与x轴正半轴和y轴正半轴交于A,B两点,点Q与点P关于y轴对称,O为坐标原点,若 ,则点P的轨迹方程是 [ ]
【判断题】Should the names of the books be underlined in handwritten type or italicized in printing?
【判断题】只要输入有界,则输出一定有界的系统称为稳定系统
【简答题】[ A] given names [B] frrst names [ C ] family names [ D] full names
【简答题】若点(a+1,3)与点(-2,b-2)关于x轴对称,则点P(-a,b)关于原点的对称点坐标是______.
【单选题】万用表实质是一个带有整流器的 () 仪表
【单选题】The medical team ______ 5 doctors and 3 nurses was sent to Africa last week.
【单选题】在进出口业务中,能够作为物权凭证的运输单据有( )