【判断题】The book that its cover is red is on the desk.
【单选题】下列选项中不属于母材熔化的断面形状的是()
【判断题】The book which/that was lying on the table is mine.
【判断题】( a + b )型钛合金中的 b 相是体心立方结构,塑性比 a 好,可通过热处理提高强度。
【判断题】The syntactics of English includes grammar suggests that the words in the preceding nonsence sentence might be rearranged to form the grammatically correct sentence "The book is on the desk by the doo...
【单选题】以下关于钛合金的论述,不正确的是( )
A.
根据组织中的相分类: α 型、 α+β 型、 β 型。
C.
钛合金是飞机的关键结构材料,用于飞机机体和发动机中要求强度高、热强性好的部位。