Pericardial effusions typically lead to low QRS voltages or electrical alternans, and can be seen on an echocardiograph.

心包积液常显示QRS低电压或电交替现象；超声心动图也可做出诊断。

They are represented by high and low voltages.

它们由高电压和低电压表示。

This meticulous process results in actuators that require significantly lower voltage and can carry more payload.

这种细致的过程使得执行器所需的电压显着降低，并且可以承载更多的有效负载。