Amplifier self - oscillates at a frequency depending on the velocity of the fluid.放大器自激振荡的频率就取决于流体的速度.His mood oscillates between euphoria and depression.他的心情在幸福感与沮丧的两极端间游移((一下心花怒放,一下又变得愁眉苦脸)).In this way the torso oscil...
There are many good automatic, semiautomatic, and hand feeding devices available commercially.市场上已有许多优良的自动 、 半自动和手工饲喂装置出售.Manual control or electric control of pressure , time , temperature or semiautomatic control.操作采用手...