切断低压;
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。
A study of cutoff properties of low permeability reservoirs
低渗透油层物性下限研究
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