在编写封隔器堵水施工设计过程中,套管尺寸清楚,射孔数据准确,卡点层段无串槽,()光洁无粘结物。
A、油管外壁
B、人工井底
C、射孔井段
D、套管内壁
参考答案:D
_____________斗酒诗百篇,长安市上酒家眠。天子呼来不上船,自称臣是酒中仙。[ ]
A.杜甫
B.王维
C.李牧
D.李白
What _____ the forest of the USA in the last 350 years?[ ]
A. has happened to
B. is happened to
C. has happened at
D. is happening