题型:问答题 简答题 ----You _______ part in the party in time. ----Sorry I was delayed by the accident.A.are supposed to takeB.have supposed to take C.are supposed to have takenD.supposed to take 查看答案
题型:问答题 简答题 在一次罐头保温试验中,发现有5个罐头出现膨胀现象。假如膨胀罐头穿孔后有气体逸出,无腐败味且此气体和氧气混合后可燃烧生成水。此罐头可判定为A.生物性胖听B.平酸腐败罐头C.正常罐头D.化学性胖听E.物理性胖听 查看答案