相关知识点: 试题来源: 解析 在波的上下文中,位移是指介质中的粒子从其平衡位置移动的距离。 在波的传播过程中,介质中的粒子会围绕其平衡位置振动。位移指的是粒子在某一时刻偏离其平衡位置的距离,可以是正值或负值,取决于粒子相对于平衡位置的位置。反馈 收藏 ...
A. Stations remaining off the air to safeguard proprietary information. B. Two three-minute silent periods, at the top and bottom of every hour, that provides a transmitting “window” for distressed vessel to transmit distress alerts. C. Stations not directly involved with the on-going distress...
A. Stations not directly involved with the on-going distress communications may not transmit on the distress frequency or channel B. Stations remaining off the air to safeguard proprietary information C. Two three-minute silent periods,at 15 and 45 minutes after the hour,that provide a transmitt...
何谓...、意味着...、...的意义是...双语例句 1.Let me explain what is meant by determination by repeating a statement made by Rotary International during the Executive Board meeting in January.让我重复国际扶轮社在一月执行委员会会议期间的一项声明，解释决心意味着什么。2.Nevertheless, ...
这里meant 是mean 的被动语态。例(1)：主动语态： “Forthrightness” means what?被动语态： What is meant by “forthrightness”?例(2)：主动语态： Rita writes a letter.被动语态： A letter is written by Rita.例(3)：主动语态： 一辆车撞死了行人 被动语态： 行人被一辆车撞死...
解析 mean 意味着,意思是 be meant 这里是个被动语态,一般会出现在问题中吧.比如说:What is meant by “where there is a will,there is a way”?就是“. 分析总结。 bemeant这里是个被动语态一般会出现在问题中吧结果一 题目 What is meant by XXX?meant是名词吗?What is meant by XXX?what 主语is ...
6(a) Explain what is meant by(i) a progressive wave,[2](ii) the diffraction of a wave.[2](b) Two microwave sources S1 and S2 are situated as shown in Fig. 6.1. The waves emitted by the two sources are in phase and are polarised in the same plane.1》P -5.0cm o-1S2一一3.2...
Electrolysis is a process that utilizes electrical energy to drive a non-spontaneous chemical reaction. This process involves the flow of direct current through an ionic compound, either molten or dissolved in a suitable solvent, resulting in chemical decomposition. The question is in English, but ...
The resulting oscillations o f the trolley are simple harmonic.The acceleration a o f the trolley is given by the expression。=-()×where x is the displacement o f the trolley from its equilibrium position.The mass o f the trolley is 840g.Calculate the frequency f o f oscillation o f...
6.1(i) The glass core is surrounded by a plastic cladding.State and explain which material has a higher refractive index and explain your answer..[2](ii)The light ray enters the air-glass interface at 45°.Calculate the angle of refraction in the glass core.angle of refraction =...[2]...