frequencies

Positive frequencies are produced by anticlockwise rotation and negative frequencies by clockwise rotation.

正频率是用逆时针旋转来产生,而负频率是用顺时针旋转来产生.

This radio station broadcasts on three different frequencies.

这家电台用三种不同的周率广播.

Electromagnetic radiation with frequencies in the ultraviolet and visible region can be absorbed by molecules.

分子能吸收频率在紫外和可见光区的电磁辐射.

The two constituent frequencies are clearly discernible.

可以清楚地辨别出两种成分的频率来.

The electromagnetic spectrum covers an enormous range of frequencies and energies.

电磁波谱包括极大的频率和能量范围.

At low frequencies, such as 10 per sec., pulsation is sensed rather than vibration.

在低频率(譬如每秒十次)时, 所感觉到的是脉冲而非振动.

The high frequencies are attenuated.

高频成分被削减.

The frequencies of the returned beams are compared with them to obtain the true ground speed.

将它们与反回射束作对比而获得真实的地面速度.

Confined waves have definite frequencies.

被限制的波具有确定的频率.

If the frequencies are low, this approach cannot be used.

若频率很低时, 这种方法就不能使用.

Add the frequencies in each class to find the class that contains that centermost element.

把每一组的频率逐组相加,找出包含中位数的那一组.

The deformation frequencies are not sufficiently distinctive.

其变形频率不是十分明显的.

For an initial service, a 10 megahertz-wide band of frequencies will be needed.

初始服务需要10兆赫宽的频带。

Resonant frequencies are related to the shape and size dimensions of the element.

共振频率与这种元件的形状和大小有关.

A wavefront at high radio frequencies or optical frequencies impinging on the atmosphere is distorted.

高射电频率或光学频率的波阵面进入大气时受到畸变.