With conventional techniques, oil prices have to be above $50 to $60 per barrel—as they have been for several years—for oil sands to be economical.
如果使用传统的技术开采油砂资源而且要划算的话，其油价将会是在每桶50美元到60美元以上，其实过去这些年都是这个价。
The behaviors and characteristics of rubber in a few screws, including conventional screw, barrier screw, barrel pin screw and cut-transfer mixer screw were analyzed .
介绍了普通型、强力剪切型、销钉机筒型及传递型橡胶冷喂料挤出机螺杆螺槽内胶料流动特性理论研究的动向。
Also used for production of various conventional weapons, artillery barrel, etc.
也常用作生产各种常规武器、枪管、炮弹等。
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