A型胃炎（慢性胃体胃炎）与自身免疫有关。
参考答案：对
He has a friend who _____ the piano very well. [ ]
A. play
B. playing
C. plays
D. played
轧辊抗弯性能好，则表示轧的（）好
A.塑性
B.韧性
C.刚性
