复数+(x2-8x+15) i为纯虚数,求实数x的值.
下列图示与对应的叙述相符的是 A．图I可表示N2+3H2 2NH3的速率时间图像，t1时刻改变的条件是升高温度 B．图Ⅱ可表示用0.1 000 mol/L醋酸滴定40.00 mL0.1000 mol
I'm a middle school student. I like fashionable clothes. I like wearing a scarf. I like red shirts and I have curly hair. They all look cool. My parents and teachers sometimes ask me not to do so,
下列叙述正确的是（ ） A.铝制容器可盛装热的浓H2SO4 B.AgI胶体在电场中自由运动 C.K与水反应比Li与
抽制高强度纤维细丝可用激光监控其粗细，如图所示，观察光束经过细丝后在光屏上所产生的条纹即可以判断细丝粗细的变化A．这里应用的是光的干涉
【2011·西南师大附中第六次月考】 D Americans: Restless? Illiterate(没文化的) ? Americans are queer people: they can’t rest. They have more time, more lei
有史书记载：明朝时期，浙江的棉纺织业出现“商贾从旁郡贩棉花列长期如吾土，则民以纺织所成，或纱或布，顷晨入市，易棉花而归，仍治而纺织之
24．This photo of mine was taken ____ stood the famous tower． A．which B．where C．in which D．There
