未知题型
单项选择题 下列反应能生成乙烯的是( ) A.乙醇与浓硫酸共热至170℃ B.乙醇与浓硫酸共热至140℃ C.乙醇与乙酸共热 D.乙醇与金属钠反应
未知题型 最有价值的辅助检查是A.腹部CTB.腹部彩超C.腹部X线片D.胃镜###SXB##
单项选择题 —Shall we go to the movie tonight? —No, Id rather ______ at home with our baby. Youd better not leave it to the babysitter at night. A.you stayed B.you stay C.stayed D.stay