题型:问答题 简答题 I usually _____ the reading after I do my homework. Now I _____ the reading. [ ]A. do; doing B. am doing; do C. do; am doing D. am doing; am doing 查看答案
题型:问答题 简答题 将1 molCO和1 molH2O混合在一定条件下反应: CO+H2O(气)CO2+H2,达到平衡时剩余了75%的CO, 此平衡混合气的密度是相同条件下氢气的A.11.5倍B.5.75倍C.23倍D.30.67倍 查看答案