单项选择题 The big- eyed girl came in, ________ a cake with two ________ candles on it.A. bring; lit B. brought; lighted C. carrying;lighted D. taking; lighting

未知题型 从氨压缩机来的1．013MPa、30℃的氨按下述不同的过程膨胀到0．1013MPa，试求经过膨胀后的温度为多少?(1)绝热节流膨胀；(2)绝热可逆膨胀。

单项选择题 —Will you attend the meeting this afternoon? —But I ________ told anythingabout it.A. wasnt B. amnot C. havent beenD. wont be