已经证明,感应电压使电流的方向与产生电流的磁场力方向相反。
It was not until the 19th century that heat was considered as a form of energy.
直到十九世纪人们才认识到热是能量的一种形式。
Computers may be classified as analog and digital.
计算机可分为模拟计算机和数字计算机两种。
The switching time of the new-type transistor is shortened three times .
新型晶体管的开关时间缩短了三分之二。(或---缩短为三分之一。)
This steel alloy is believed to be the best available here .
人们认为这种合金钢是这里能提供的最好的合金钢。
Electromagnetic waves travel at the same speed as light .
电磁波传送的速度和光速相同。
Microcomputers are very small in size ,as is shown in Fig.5.
如图5所示,微型计算机体积很小。
In water sound travels nearly five times as fast as in air .
声音在水中的传播速度几乎是在空气中传播速度的五倍。
Compared with hydrogen, oxygen is nearly 16 times as heavy .
氧与氢比较,重量大约是它的十六倍。
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