The Green family _____ from the USA.[ ]
A. are
B. is
C. have got
D. has got
答案:A
最易发生幽门梗阻症状的溃疡是()
A.胃角溃疡
B.胃窦溃疡
C.十二指肠球部溃疡
D.幽门管溃疡
E.球后溃疡
假岩屑是指已钻地层受钻井液冲刷或颗粒较大上返迟缓而同()一同返出地表的岩屑。
A、钻屑
B、真岩屑
C、钻井液
D、湿岩屑