一、(12分)已知某连续时间信号x(t)的波形如图所示。 1.画出信号x1(t)=x(2-2t)+x(t-1)的波形; x(t) 2.若x(t)的频谱是X(),试用X(o)表示信号 x1(t)的频谱

I. Choose the Correct Answer 1. Which of the following quantities are independent of the choice of inertial frame? (There may be more than one correct answer) (A)Velocity (B)Acceleration (C)Force (D)Work Solution: In all the inertial frame, the forces acted on a body are same,=ma=F'=ma', therefore the force and acceleration are independent of the choice of inertial frame

I. Choose the Correct Answer 1. A particle on a spring executes simple harmonic motion. If the mass of the particle and the amplitude are both doubled then the period of oscillation will change by a factor of

一、案例分析 案例:利丰集团是一家以香港为基地的跨国商贸集团,为香港上市公司及香港恒生指数和美 国摩根士丹利香港指数成份股。利丰集团运用供应链管理的概念经营出口贸易、经销及零售 三项核心业务,迄今已有97年历史

武汉电力职业技术学院：《物流管理基础》课程教学资源（试卷习题）（中级）职业资格操作考试答辩题A