简答题同步辐射X射线的优势有窄波谱、低通量、低亮度 A、错 B、对简答题物质对X射线的吸收规律：样品厚度增加，或材料线性吸收系数高，透射X射线 A、强度下降 B、强度增加简答题In X-ray diffraction measurement, uniform strain causes peak（1）and non-uniform strain causes peak（2）。（please choose one of the three answers: shifting/broadening/unchanged） 使用X射线衍射法测量时，均匀应力使峰位（shifting/broadening/unchanged），不均匀应力使峰位（shifting/broadening/unchanged）。（每空从上述三个词中选一个填写）简答题图中晶面的晶面指数(hkl)是多少？ h=（1） k=（2） l=（3）简答题由空间群符号：P63/mmc ，可获知的信息有 A、晶系 B、布拉维点阵 C、点群 D、空间群简答题For a Ni specimen, which of the following planes do not show structure extinction? Ni样品中哪个面不显示结构消光？ A、(110) B、(111) C、(211) D、(220) E、(310) F、(311)简答题倒空间的矢量和正空间的晶面之间的关系为 A、长度：倒数 B、方向：垂直 C、长度：相等 D、方向：平行简答题同步辐射X射线的优势有窄波谱、低通量、低亮度 A、错 B、对简答题For the following diffraction peak, the intensity of the peak is (one digital after the decimal): （1） 从下面的衍射峰可看出峰强是？（小数点后保留一位有效数字）简答题The choice of Cr K alpha radiation and (211) plane to determine the stress of an iron specimen is because 选用Cr的Kα辐射和（211）晶面来测量Fe样品的应力是出于什么原因？ A、peak broadening can be easily noticed 因为衍射峰宽化容易观察到 B、the operating voltage for Cr target is relatively low 因为Cr靶的启动电压较低 C、the Bragg angle is sufficiently large 因为其布拉格角足够大 D、there is less absorption 因为吸收少简答题In Ewald sphere method to explain the diffraction condition, the following saying(s) is(are) correct. A、the radius of Ewald sphere is in reverse proportion to wavelength of X-ray. B、the length of diffracted beam vector is the same as the incident beam vector. C、the reciprocal lattice does not change with X-ray. D、the origin of reciprocal lattice coincides with the centre of Ewald sphere. E、the surface of Ewald surface indicates the diffraction condition.简答题物质对X射线的吸收规律：样品厚度增加，或材料线性吸收系数高，透射X射线 A、强度下降 B、强度增加简答题If the regression of lattice constant as a function of (cos(θ)2/sin(θ)） reads: a(angstrom) =0.00393x+6.5321, the precise lattice constant is (in angstrom, 3 digitals after the decimal) （1） 晶格常数a关于(cos(θ)2/sin(θ)）的外推直线为： a=0.00393x+6.5321（单位为埃），则晶格常数的精确值是？（单位为埃，保留小数点后三位有效数字）简答题The choice of Cr K alpha radiation and (211) plane to determine the stress of an iron specimen is because 选用Cr的Kα辐射和（211）晶面来测量Fe样品的应力是出于什么原因？ A、peak broadening can be easily noticed 因为衍射峰宽化容易观察到 B、the operating voltage for Cr target is relatively low 因为Cr靶的启动电压较低 C、the Bragg angle is sufficiently large 因为其布拉格角足够大 D、there is less absorption 因为吸收少