在处理（）卡钻时，要下砸下压，轻提转动，倒划眼，不要大力上提。
A.泥饼粘饼
B.井塌
C.泥包
D.键槽
参考答案：D
Mary is from England, but _____ friend Jim isn't English. [ ]
A. she
B. her
C. he
D. his
消化性溃疡最常见的并发症是
A．出血
B．穿孔
C．电解质紊乱
D．癌变
E．幽门梗阻
