制定管道焊接工艺指导书的依据是（）。
A.公司编制的工艺文件
B.施工技术规范
C.设计文件要求
D.焊接工艺评定
参考答案：D
The sailors returned twenty days later, .[ ]
A. felt ill, tired and unhappy
B. illness, tiredness and unhappiness
C. feeling ill, tiresome and unhappy
D. ill, tired and unhappy
—Is the cat _________ the wall?
—No, it isn't. It's _________ the door. [ ]
A. next to , under
B. on , on
C. next to , behind
D. in , behind
