More often than not, the person sitting next to you on a plane or sleeping in the next hotel room has paid more or less than you did for the same services. Each day, airlines give more than several
平面直角坐标系中,O为坐标原点,已知A(3,1),B(-1,3),若点C满足=α+β,其中α、β∈R,且α+β=1,则点C的轨迹方程为( ) A.2x+y-11=0
C Today, air travel is far safer than driving a car on a busy motorway. But still there is a danger that grows every year. Airliners get larger and larger. Some airplanes can carry over 300 passengers
下列玻璃仪器名称错误的是 A.三角漏斗 B．锥形瓶 C．集气瓶 D．长颈漏斗
图10-2-7所示是一列横波某时刻的波形图，若已知质点C正向上振动，则 A.此波向右传播B.D比C先回到平衡位置 C.此时B点速度为正，加速度为正D.再过T/2，A
细胞完成生命活动的前提是( ) A.有典型细胞核 B.有大的核仁 C.细胞保持完整性
甲 普少习吏事，寡学术，及为相，太祖常劝以读书。晚年手不释卷，每归私第，阖户启箧取书，读之竟日。及次日临政，处决如流。既薨，家人发箧视
分析各组微粒结构示意图，下列说法正确的是（ ） A．①组都属于阳离子 B．②组都属于阴离子 C．③组属于一种原子
