The measurement error of differential absorption laser radar caused by the shift of its center frequency in measuring atmosphenc density has been discussed particularly.
详细地讨论了微分吸收激光雷达测量气体密度时中心频率的漂移所引起的测量误差。
It has adopted colloid electrolyte technology, avoiding density stratification problem of acid solution and eliminating plate corrosion and passivation caused by density stratification.
采用胶体电解质技术，绝无酸液浓度层化问题，完全消除因浓度层化引起的极板腐蚀和钝化现象。
Zipcar has had challenges in the us - a low utilisation rate caused by low population density and vehicle dislocation [sending someone to retrieve the car is a problem].
在美国，在线汽车租赁遇到了很大的挑战，低人口密度和低机动车复位率(没有人将那些使用过的汽车归回原位)导致网站利用率很低。
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