钢材经过冷加工冷拉、冷弯、冲孔、机械剪切所产生的冷作硬化应变硬化后，其()基本保持不变。
D
暂无解析
Hewasalmostasleep,____withallthishardwork.
Tom____ofhiswifehowshehadmetherfriend.
Dr.Yangworked______threedaysago.
Nowhereinnatureisaluminumfoundfree,owingtoitsalways____withotherelements,mostcommonlywithoxygen.
As____clearfromhismanners,heisateacher.
