在液压系统中用于调节进入执行元件液体流量的阀是()A、溢流阀B、单向阀C、调速阀D、换向阀...
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蠕墨铸铁的()明显低于球墨铸铁。A、铸造性能B、导热性C、强度D、焊接性能...
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高碳钢最佳切削性能的热处理工艺方法应是()。A、完全退火B、球化退火C、正火D、淬火...
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固溶强化是指因形成固溶体而引起合金强度、硬度升高的现象。...
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麻花钻的几何参数中,直径倒锥角是()参数;顶角是()参数,前角与后角是()参数。...
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磨削加工中,砂轮粒号过大,砂轮易(),磨削性能(),同时还会引起()。...
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与埋弧自动焊相比,手工电弧焊的突出优点在于()。A、焊接后的变形小B、适用的焊件厚C、可焊的空间位置多D、焊接热影响区小...
Sunday, October 8, 2023
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Saturday, September 10, 2022
蠕墨铸铁的()明显低于球墨铸铁。A、铸造性能B、导热性C、强度D、焊接性能...
Sunday, March 24, 2024
高碳钢最佳切削性能的热处理工艺方法应是()。A、完全退火B、球化退火C、正火D、淬火...
Friday, May 26, 2023
与埋弧自动焊相比,手工电弧焊的突出优点在于()。A、焊接后的变形小B、适用的焊件厚C、可焊的空间位置多D、焊接热影响区小...
Sunday, October 8, 2023
Friday, January 13, 2023
从灰口铁的牌号可看出它的()指标。A、硬度B、韧性C、塑性D、强度...
Thursday, January 11, 2024
Tuesday, November 21, 2023