金属产生塑性变形的条件是（）。
A: oS≤oB: a≤B ；
C: 0>oS
A: oS≤o
C: 0>oS
举一反三
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- 提高I/O速度和设备利用率，在OS中主要依靠功能
- 下面导入标准库os语句正确的是( ). A: As os B: To os C: import os D: From os
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