如果用一台变压器在负荷高峰时期负荷率超过()以上时,则可以考虑用2台变压器,以达到经 发布时间:2019-10-08 20:28 │ 来源:www.tikuol.com 题型:单项选择题 问题: 如果用一台变压器在负荷高峰时期负荷率超过()以上时,则可以考虑用2台变压器,以达到经济运行的目的。A.70%;B.80%;C.90%;D.85%
题型:单项选择题 Why haven't you finished your homework yet? You___________ to have finished it by last Sunday.A.are supposedB.were supposedC.are supposingD.were supposing 查看答案