一台三相变压器,SN=200kVA,U1N/U2N=1000/400V,Y/Δ接法,当此变压器额定运行时,二次绕组中流过的电流值为 ()指的是相电流
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧