问题
问答题 简答题
含砾石的地层能不能使用PDC钻头?
答案
参考答案:
PDC钻头所钻地层必须是均质地层,含砾石的地层不能使用。
含砾石的地层能不能使用PDC钻头?
参考答案:
PDC钻头所钻地层必须是均质地层,含砾石的地层不能使用。
根据对话情景和内容,从对话后所给的选项中选出能填入每一空白处的最佳选项组合。选项中有两个为多余选项。 (Alice advises(劝告)Bill to read English every day and agrees to help him ...) Alice:Why don 't you look happy ? Bill:Because I have a lot of trouble with my English.I can hardly pass the exam every time. 6 Alice:Don 't worry. 7 Bill:No,I only read English before the exam. Alice:Ah,that's it.If you want to study it well,you must practise it every day. 8 Bill:I'll take your advice and try to practise reading English every day. 9 Alice:All right.I'd like to.But in fact I still have some trouble with English,too. 10
A:6-⑤;7-⑦;8-⑥;9-①;10-②; B:6-⑥;7-⑦;8-①;9-②;10-③; C:6-①;7-②;8-④;9-⑦;10-⑤; D:6-③;7-①;8-⑥;9-②;10-⑤; |