雌雄鉴别

Little difference between male and female appearance Lo, David Lo stage it is difficult to identify, as Lo is the difference between the most obvious: the same rearing conditions, the same age in the general female screw than that of the male body; female snails recessed central operculum, the operculum and hung Lo Centralaround.

雌雄螺外观差异不大，幼螺阶段难以鉴别，成螺最明显的区别是：相同饲养条件下，同龄螺中一般雌体比雄体大；雌螺的厣中央凹进，而雄螺的厣中央外凸，四周微凹。

2Some specific nucleoside acid bands were amplified from genomic DNA of male and female plants with RAPD technique, indicating that some gene marks related to sexes of Pistacia Vera were found. RAPD signal is an reliable, accurate identifying technique on sexidentification of Pistacia Vera.

2利用RAPD手段对阿月浑子雌雄株基因组DNA扩增后找出性别之间差异性的核苷酸片段，即找到部分与阿月浑子性别相关的基因标记，从而快速而有效地鉴别雌雄株，差异显著。

The difference of male and female Pistacia Vera were compared and analyzed through treating with chemical reagent, surveying the morphology, RAPD techniques, analyzing the chromosome and comparing the band pattern of isoenzyme. The following results and conclusions were drawn:The leaves of male and female Pistacia Vera were treated respectively with chemical reagent. The sexes were identified quickly and efficiently through different color and precipitate reaction among them. The difference is significant.

本文采用化学药剂处理、形态学观察、RAPD技术、染色体压片分析及同工酶谱带分析等方法分别进行了阿月浑子的雌、雄株差异性比较分析，得出如下结论：(1)采用化学药剂分别处理阿月浑子雌雄株叶部提取液，通过不同的颜色反应和沉淀反应可以快速而有效地鉴别雌雄株，并且差异显著。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。