切断低压;
A study of cutoff properties of low permeability reservoirs
低渗透油层物性下限研究
The base and emitter transit time increase and the cutoff frequency decreases at low temperature due to the trapping effect of shallow energy level impurities.
而由于浅能级杂质的陷阱效应,低温下基区和发射区渡越时间变长,截止频率下降。
简答网 · 高考英语
简答网 · 初中英语作文