2-1 (1)(2)假设A下滑 gcos660°-ta=ma t -m-30°=mb 得a mAgcosMBgcoS360-30° +m =-0.12m/s2 系统 =TB ma+mB 将向右边运动

7-5 解:H(s)= ,|H(A2) A=△O2|H(1Q2)=△ y+()2v041=0999 P A2=△H(2)=△2 1+(3)2√26△1≈0981△2 0.197 V(1)= Q2Cos(Q21-4e/3

Fluid Mechanics and Mechanical Engineering Sections 今 Fluid statics Fluid Dynami Aerodynamics Fundamentals S 1. Fluid Properties A fluid is a substance that deforms

Chapter 13 Cell apoptosis 1. Extracellular cotrol of cell division cell growth, and apoptosis Mitogens stimulate G1-Cdk and G1/S-Cdk activities

The Many roles of the President chief of state-the role of the president as the ceremonial head of government chief executive-- the role of the president as the head of the executive branch of the government commander in chief of the armed forces-- the role of the president as the supreme commander of military forces of the U.S

DACO832是一个8位D/A转换器芯片,单电源供电,从 +5V~+15V均可正常工作,基准电压的范围为±10V,电流 建立时间为1μs,CMOS工艺,低功耗20m。其内部结构如图 9.1所示,它由1个8位输入寄存器、1个8位DAC寄存器和1个 8位D/A转换器组成和引脚排列如图9.2所示

渗透系数又称水力传导系数,是 描述介质渗透能力的重要水文地质参 数。根据达西公式,渗透系数代表当水 力坡度为1时,水在介质中的渗流速 度,单位是md或cm/s。渗透系数大小 与介质的结构(颗粒大小、排列、空隙 充填等)和水的物理性质(液体的粘滞 性、容重等)有关 导水系数即含水层的渗透系数与其 厚度的乘积

Civil Liberties versus civil Rights civil liberties involve restraining the government's action against individuals civil rights are rights all individuals share as provided for in the 14th amendment, which guarantees equal protection under the law

Who Is Eligible to Run for office there are few eligibility requirements to run for most U.S. offices President must be a natural born citizen must be 35 years old must be a resident of the country for 14 years before inauguration Vice President must be a natural born citizen must be 35 years old

What is Foreign policy? ~ nation's' external goals and techniques and strategies used to achieve them American foreign policy includes national security policy, which is policy designed to protect the independence and the political and economic integrity of the United States