煤热解产物
参考答案：
煤气、焦油及半焦或焦炭。其中煤焦油和焦炭是有机化工原料的主要来源。
Not until the motorbike looked almost new ________ repairing and cleaning it. [ ]
A. he stopped
B. did he stop
C. stopped he
D. he did stop
呕血伴黄疸见于（）。
A.胃黏膜脱垂症
B.胆道疾病
C.幽门撕裂伤
D.消化性溃疡
E.慢性胃炎
