This text reports the tracks of studying to the shape and density of gland trichomes for 11 different genotype of flue﹣cured tobacco in mature period.
为提供优质烤烟新品种选育中提高香气质和香气量的依据，对中国11个烤烟品种定型叶片的腺毛密度和在成熟过程变化的规律进行了跟踪研究。
The main circuits of a magnetic head positioning system with a density of 8 tracks per millimeter (TPM) based on a 4 TPM system are described with the performance of the system analysed and discussed.
本文介绍了一个磁道密度为每毫米八道的磁头定位系统，该系统是将每毫米四道的系统加以改进而得。文中给出了该系统的主要电路，并对系统的性能进行了分析和讨论。
In addition to the density of fission tracks (apparent age), the change of their length and distribution can provide the information of paleotemperature.
除径迹密度(表观年龄)外，径迹长度及其分布的变化也与古地温有关。
The countless networks of tracks operated regionally are being linked, their density increased; the number of passengers is rising rapidly.
数不清的地方运输铁路网络连接起来，密度增加了，旅客的数量也在迅速增长。
The countless networks of tracks operated regionally are being linked, their density increased; the number of passengers is rising rapidly.
数不清的地方运输铁路网络连接起来，密度增加了，旅客的数量也在迅速增长。
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