It is very difficult for the beginners to master the common methods of processing echelon screw thread because of the high difficulty in the process and the high request to the operators.
常见的梯形螺纹车削，由于车削加工难度较大，操作技能要求较高，因而使初学者学习起来较困难。
How does this SQL how to write, master come in, thread a hand.
请问这个SQL怎么写，高手请进，跟帖有分。
Floor master is not like words, how can you post such thread.
楼主不象话，怎么能发这种帖？
Floor master is not like words, how can you post such thread.
楼主不象话，怎么能发这种帖？
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