已选分类
工学材料科学与工程
单选题下列Burgers矢量可能表示了简单立方晶体中的全位错：
单选题六方晶系中晶面间距______晶面间距。(A)小于(B)等于(C)大于
单选题三元合金相图中，共晶反应的三相平衡的连接三角形应为______。
单选题Which of the following symbol is used to specify a family of directions in a crystal structure? A) ＜ ＞ B) ( ) C) [ ] D) {}
单选题长石属于______类型的硅酸盐结构。 A．岛状硅酸盐结构 B．层状硅酸盐结构 C．链状硅酸盐结构 D．架状硅酸盐结构
单选题铸铁与碳钢的区别在于有无______。 (A) 莱氏体 (B) 珠光体 (C) 铁素体
单选题Which statement is MOST TRUE about materials technology? A) Existing specifications and laws make it easy to introduce new materials in fields such as building construction and commercial aircraft. B) Materials Science and engineering usually follows the lead of developments in other technologies C) Industry and the consumer are quick to accept new materials and processes innovations D) Developments in materials science and engineering have allowed for innovations in most other technologies.
单选题大多数固相反应是由界面上的化学反应速度所控制的。
单选题A useful tool that is used to study the crystal structures of solids by measuring the angles of electrons glancing off material specimens. A．Electronmicroscope B．Opticalmicroscope C．X-ray diffraction (XRD) D．Differential thermal analysis (DTA)
单选题调质钢的含碳量大致为( )。 A．0.1/%～0.25/% B．0.25/%～0.50/% C．0.6/%～0.9/%
单选题玻璃在常温下能长期稳定存在，因而它是热力学稳定态。
单选题Bonding agent or binder that provides a flexible layer between the fiber and the matrix. A) Matrix B) Reinforcer C) Coupling agent D) Interphase
单选题对离异共晶和伪共晶的形成原因，下述说法正确的是______。
单选题______ are stored with the resin and catalyst (or hardener) separated; when mixed the catalyst cause cross-linking of the resin. A．hot-melt adhesives, B．loss-of solvent adhesives C．anaerobic adhesives, D．two-part mix adhesives.
单选题______ is the name of the recently discovered carbon structure that resembles a soccer ball. A) Diamond B) Graphite C) Fullerene D) Nanotube
单选题氯化铯(CsCl)为有序体心立方结构，它属于______。
单选题与金属和陶瓷相比，高聚物的强度和弹性模量( )。 A．比金属低，比陶瓷高 B．比陶瓷低，比金属高 C．均低于陶瓷和金属
单选题直径为10mm的45钢棒，加热至850℃投入水中，其显微组织应为( )。 A．M B．M+d C．M+Ar D．M+P
单选题再结晶结束后发生晶粒长大时的驱动力主要来自______。
单选题The key word in describing covalent bonding is ______ A) Transferring B) Sharing C) Swapping D) Swarming