单词	环绕地球轨道
释义	同環繞地球軌道
随便看	threshold signal threshold signal-to-interference ratio threshold speed threshold--speed threshold stability threshold stimulus threshold stress intensity factor threshold switch threshold temperature threshold temperature coefficient of semiconductor threshold temperature coefficient of semiconductor--laser threshold theorems threshold (thr) threshold trait threshold treatment threshold tuning threshold value threshold value of contrast threshold valve threshold velocity threshold visibility threshold voltage threshold voltage control threshold voltage deviation threshold voltage dispersion