诱发肝昏迷的因素()
A．过多使用利尿剂
B．大量放腹水
C．上消化道出血
D．进食过多蛋白质
E．经常肥皂水灌肠
参考答案：A,B,C,D,E
混凝剂采用湿发投加时，采用（）投加，可不必另配计量设备。
A.重力
B.计量泵
C.干粉
D.溶解
In the preface （） my book, I express my sincere gratitude to all the teachers and friends who have been of help to me during my three years' life in the university.
A．on
B．for
C．to
D．in
