查询词典 sex ratio

The results showed that the sex ratio of pupae and adults is 1:1.0430 and 1:1.0154,respectively.The 80% beet armyworm emerged generally during night after pupation about 4~8 d,and more than half in 0:00~8:00 am.

结果表明：甜菜夜蛾蛹的性比为：1：1.0430，羽化之后的成虫性比为1：1.0154；甜菜夜蛾羽化集中在化蛹后4￣8 d，且化蛹具有显著的昼夜分布特点，夜间羽化数占总数的80%左右，其中0：00￣8：00之间羽化数达一半以上；成虫单次交配持续时间为40￣100min的发生概率占70.44%，85%以上的交配集中发生在夜间2：00￣7：00；成虫主要在夜间产卵，其中在0：00￣5：00时辰占65%以上。

Methods The larva and adult rat flea were reared with artificial diet and white mouse respectively.The process of larva pupation and adult emergence were recorded,and the sex ratio was calculated during the flea development.

用人工饲料和小白鼠分别喂饲印鼠客蚤的幼虫和成蚤，在饲养过程中记录幼虫的化蛹和羽化过程，并鉴别羽化成蚤的性别。

The security problems in our country are low population growth rate and overpopulation,population quality not conforming to the requirement of social development,AIDS and other diseases threatening population health,high sex ratio,quick aging and the pressure of employment,etc.

一、人口安全问题的提出人口安全是一个国家最基本、最重要的安全问题之一，直接关系国家的整体安全、社会的持续稳定和健康发展。

Assulta was studied in the present paper. Based on the successful reciprocal crosses, sex ratio and fertility of the hybrids in larvae, pupae and adults were investigated. In addition, the physiological mechanisms and genetic basis of host plant ranges of H.

在此基础上，利用解剖和观察等方法对子一代幼虫、蛹和成虫的性别比例和可育性进行了较为系统的研究；并利用比较的方法对棉铃虫和烟青虫食性广度的生理机制和遗传基础进行了初步研究。

In the 1990s South Korea had a sex ratio almost as skewed as China's.

在上个世纪90年代，韩国的男女性别比例和中国一样扭曲。

The sex ratio is 50 percent men to women.

男女性别比率是50%。

Its sex ratio is 2:1 in favor of females.

它的性别比支持雌性是 2：1 。

But the sex ratio varies slightly in different circumstances and for different families.

但是这种比率在不同的环境不同的家庭中有些许不同。

At that time all of the track objects are 17-year-old, all white, like the sex ratio.

当时所有的追踪对象都是17岁，全部是白人、男女比例一样。

In China the sex ratio for the generation born between 1985 and 1989 was 108, already just outside the natural range.

在中国，1985至1989年间出生的一代性别比为108，已经超过了自然的范围。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。