Many elements in nature are found to be mixtures of different isotopes.<br>Both compounds are acids: the former is strong, the latter is weak.<br>Three. In this chapter, we trace the history of modern chemical industry.<br>Frequency, wavelength and sound speed are closely related.<br>The units of "ampere", "ohm" and "volt" are named after three scientists respectively.<br>The cutting tool must be firm, tough, hard and wear-resistant.<br>It's easy to see what weight can be overcome and what thrust is necessary to keep flying.<br>The resistance of the pipe to the flow depends on the length of the pipe, the diameter of the pipe and the characteristics of the inner wall (rough or smooth).<br>When you turn a switch, you can easily operate lighting, heating or electric powered electrical equipment.<br>The best conductor has the least resistance and the worst conductor has the most resistance.<br>Generally speaking, all metals are good conductors. Silver is the best, followed by copper.<br>The frequency range of this laser beam is very narrow.<br>Radar emits electromagnetic waves of very short wavelength.<br>It is not surprising that when the humidity is low, the moisture in the fruit evaporates rapidly.<br>
正在翻译中..