McCarthy: (Mr. Chairman) ...in view of Mr. Welch's request that the information be given once we know of anyone who might be performing any work for the Communist Party, I think we should tell him that he has in his law firm a young man named Fisher whom he recommended, incidentally, to do the work on this Committee, who has been, for a number of years, a member of an organization

假定我们对一个处于热平衡的恒温(T的体系感兴趣。对该 热力学问题我们做如下的表述。设有一个包含N个粒子的恒温的 平衡态系统,我们要计算该系统的可观测量A,即该物理量的平 均值 (A(T)=2-A( ((') 其中H(x)为系统的哈密顿量描述,f(为分布密度函数,称为 配分函数,它是归一化常数

Chapter 2 Aerodynamics: Some Fundamental Principles and Equations There is so great a difference between a fluid and a collection of solid particles that the laws of pressure and of equilibrium of fluids are very different from the laws of the pressure and equilibrium of solids Jean Le Rond d' Alembert, 1768

0644液压传动的动力元件通常是指 A.油泵B.油马达C.油缸D.A+B0645液压马达是将能变为能。 A.电,液压B.液压,机械C.机械,液压D.电,机械

0001下列泵中属于叶轮式泵的是 A.齿轮泵B.叶片泵 C.水环泵D.旋涡泵 0002不属于回转式容积式泵的是 A.水环泵B.齿轮泵C.螺杆泵D.旋涡泵 0003属于回转式容积泵的是 A.离心泵B.水环泵 C.旋涡泵D.轴流泵

1.一调光台灯由单相交流调压电路供电,设该台灯可看成电阻负载,在a=0°时输出功率为最 大值,试求功率为最大输出功率的80%、50%时的开通角a 2.一单相交流调压器,电源为工频220V,阻感串连作为负载,其中R=0.5Q,L=2mH试求: ①开通角a的变化范围;②负载电流的最大有效值③最大输出功率及此时电源侧的功率因数

Thank you ladies and gentlemen for a very warm reception. It was one hundred and forty-four years ago that members of the Democratic Party first met in convention to select a Presidential candidate. Since that time, Democrats have continued to convene once every four years and draf t a party

Lyndon Baines Johnson: \We Shall Overcome\ Mr. Speaker, Mr. President, Members of the Congress: I speak tonight for the dignity of man and the destiny of democracy. I urge every member of both parties, Americans of all religions and of all colors, f rom every section of this country, to join me in that cause. At times history and fate meet at a single time in a single place to shape a turning

Jimmy Carter: \Energy and the National Goals - A Crisis of Confidence\ Good Evening: This a special night for me. Exactly three years ago, on July 15, 1976, I accepted the nomination of my party to run for President of the United States. I promised you a President who is not isolated f rom the people, who feels your pain, and who shares

The nature of language A definition: Language is human speech; the ability to communicate by this means; a system of vocal sounds and combinations of such sounds to which meaning is attributed, used for the expression or communication of thoughts and feelings; the written representation of such a system. (Webster's New World Dictionary)