1.
Geometric conditions for photographic reflection density measurement
GB/T12822-1991摄影反射密度测量的几何条件
2.
scanning reflective microdensitometer
扫描反射显微光密度计
3.
ionizing radiation backscatter soil density meter
电离辐射反散射土壤密度计
4.
Reflectivity depends on the velocity and density of rocks.
反射能力取决于岩面的速度和密度。
5.
Study on the Optimization Inversion Algorithm of Photon Density Wave Scattering;
光子密度波散射的优化反演算法研究
6.
Research on Precision Small-Angle Measurement Tecnology Based on Total Internal-Reflection;
光学内反射法小角度精密测量技术的研究
7.
Study on the Influence on the Polarized Reflection by Loessial Dense Degree;
黄土致密程度对其偏振反射的影响研究
8.
density meter(of ionizing radiation)
（电离辐射）密度计
9.
Since velocity and density generally increase with depth, the reflection coefficient is usually positive.
因为速度和密度一般是随浓度而增加，故而反射系数通常为正值 。
10.
The ability of the ionosphere to reflect these waves is dependent upon normal variations in the electron density at different levels.
电离层反射电波的能力取决于不同高度上电子密度的正常差别。
11.
Schmidt-type optical system
施密特反射望远镜系统
12.
Research on surface flattening technology of the precision forming for large curvature reflector panel
大曲率高精度反射器面板精密成形坯料展开技术
13.
The research on surface stability of the forming of high precision for large and high precision reflecting panel
大型夹层结构高精度反射器面板精密成形及型面稳定性
14.
modulated beam microdensitometer
调制射束显微密度计
15.
Density meters utilizing ionizing radiation
GB/T13980-1992电离辐射密度计
16.
radioactive sediment density probe
放射性沉积物密度探针
17.
ionizing radiation transmission density meter
电离辐射透过式密度计
18.
scanning transmission microdensitometer
扫描透射显微密度计