A.8mA B.10mA C.12mA D.16mA
A.允許通過(guò)的電流是4~20mA B.允許通過(guò)電流,但不大于5mA C.必須施加電壓源 D.應(yīng)該進(jìn)行相應(yīng)的溫度補(bǔ)償
A.90~180s B.30~90s C.10~30s D.沒(méi)有時(shí)間規(guī)定