【判断题】淬火钢在某些回火温度内回火时,钢的冲击韧度明显降低,这种现象称为回火脆性。
【判断题】淬火钢随着回火温度的升高,钢的硬度值显著降低,这种现象称为回火脆性。
【简答题】第二类回火脆性是在较高温度区间内回火,出现冲击韧性显著降低的现象,因此称为(__)回火脆性。
【简答题】何谓搜索引擎营销,搜索引擎营销的方法有哪些?
【判断题】项目干系人管理的主要作用是确保项目能够满足其所期望的各种需求。(140703班凡槿译)The primary role of project stakeholder management is to ensure that the project will satisfy the stated needs for which it was undertaken.
【单选题】— What a hot day! — The weather report says it will be much ______ tomorrow. [ ]
【简答题】_____的目的是确保项目满足其所需的需求。(140703班介龙平译) The purpose of _____ is to ensure that the project will satisfy the needs for which it was undertaken.
【判断题】在进行液压系统的安装时,溢流阀的回油管口,应尽量接近泵的吸油口,以便吸油通畅。
【判断题】淬火钢随着回火温度的升高,钢的硬度值显著降低,这种现象称为回火脆性