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- Gravel particle density, hardness, as exempt by the National Product. 砂石颗粒疏密，硬度大，被国家定为免检产品。
- The incompressibility of the fluid is determined by introduction of a so-called particle density number. 流体的不可压缩性是通过引人粒子数密度概念实现的。
- The results show that the particle density in the films periodically oscillates indicating a formation of layered structures. 结果表明：薄膜中粒子密度沿膜厚方向呈周期性变化，存在某种有序结构；
- This paper discussed the cause of distinction of the particle density and the orgin of tubular and vesicular structure in spaces. 本文还讨论了细菌周膜断裂面上颗粒密度不同的原因及腔中管泡状结构的来源。
- The nonlinear space charge effect due to the nonuniform particle density distribution in bunched beam of a linac is discussed. 提出了在强流直线加速器中,由空间电荷束团的密度分布所引起的非线性效应。
- The experimental results demonstrated that the magnet field could obviously increase the discharge current and enhance the particle density in corona discharges. 在负电晕放电中,磁场可提高极间自由电子的能量,增加带电粒子的浓度,增大放电电流。
- Effective Ice Particle Densities Derived from Aircraft Data. 从飞机数据得到的有效冰粒子密度。
- Usually it streams past the earth at less than 1 million m.p.h., but when that wind gushed from a rare gap in the sun's tangled magnetic web, its velocity exceeded 2 million m. p. h. and particle density was 30 times normal. 通常，太阳风流经地球的速度不会超过每小时100万英里，但是，当这股风是从太阳扭结在一起的磁网罕见的断层中喷出的时候，其速度就会超过每小时200万英里，密度是一般带电粒子流的30倍。
- The method is testing the particle sheer stress, velocity gradient at different speed of rotation by adopting different particle density and different particle diameter suspensions. 试验结果与拜格诺试验的结果完全一致，将其结果延伸，所采用的试料更加符合生产实际。
- For a transient internal point source, using the comple mentarity relation, the evolution of particle density can also be described by the well-behaved generalized Fourier expansion. 对于瞬间内部点源产生的密度剖面演化，通过解的互补性也可得到品质好的广义傅里叶展开表示。
- The particles in an atom are infinitely small. 原子里的粒子极小。
- He is studying the properties of these particles. 他在研究这些粒子的性质。
- Such fine particles suspend readily in water. 这种微粒极易悬浮在水中。
- Light often behaves as if it were made of particles. 光常常表现出好象它是由粒子组成似的。
- Substances consist of small particles called molecules. 物质是由叫做分子的微粒组成的。
- The particles that descend in this fashion. 辐射尘以这种方式落下的放射性粒子
- We can see the dust particles floating in the sunlight clearly. 我们可以很清楚地看到阳光下的灰尘颗粒。
- In gases, the particles are far apart, with empty space between. 在气体中分子之间的距离很大，彼此之间有空隙。
- The density of population in this city is very high. 这个城市的人口密度非常高。
- He discovered some pinpoint particles in the liquid. 他在液体中发现了一些极其微小的细粒。
