查询词典 half-life period

And hand in recent frontal hatless half-length photos; To present documents of certification pertaining to the purposes for entry of the invitation letter from the host institution or the certificate-issuing authority; those who come to China for residence of one year or more shall produce health certificates including AIDS serum examination report issued by health departments designated by the governments of the countries the applicants reside in , the health certificates shall remain valid within a period of six months as of the date of issue.

申请签证需要哪能些证明？提供有效护照或者能够代替护照的证件，填写签证申请表、交近期正面免冠半身照片，交验与申请入境事由有关的证明或聘清单位或发证机关的邀请函电，来中国居留1年以上的，还须交验所在国政府指定的卫生医疗部门签发的包括艾滋病血清单检查在内的健康证书，健康证明书自签发之日起6个月有效。

Even if he's been itemizing it for almost half of the period, I was inapprehensive. Mr. Holmes' lofty and strong body lowered down when seeing me raising hands.

虽然Holmes老师已花了约半节课的时间讲解作业要求，可我还是没完全明白。

I never think that half an hour is an insignificantly short period of time.

我从来不认为半小时是微不足道的。

I never think that half an hour is an insignificantly short period of time .

我从不认为半小时是微不足道的一小段时间。

Data show that the first half of A-share listed company IPO financing amounted to 90.602 billion yuan, up 33 percent reduction; and the same period of corporate bonds and corporate debt issuance size and funding has increased the size of listed companies bond financing the first time, more than the stock market IPO financing lines have been issued during the 30 corporate bonds and 13 corporate bonds to raise funds a total of 92.95 billion yuan.

数据显示，A股上市公司上半年的IPO融资总额为906.02亿元，同比减少百分之三十三，以及公司债券同期发行公司债券的规模和资金，增加了上市公司融资债券的规模首次超过股市IPO融资线已在30和13个公司债券发行公司债券筹集资金的总额929.5亿元。

B Of the six basic media MS, MS1/2 (half-strength of MS salts and vitamins), WPM, DKW, B5 and SH, MS1/2 was the most proper one to induce somatic embryos. Somatic embryos generally regenerated directly from excised zygotic cotyledons. PGRs combination affected somatic embryogenesis significantly. Medium with NAA 1mg/L, TDZ 0.05mg/L, IBA 2—10mg/L combined with BA 10mg/L, or IBA 10mg/L integrated with BA 0-2mg/L gave the highest induction rate. Excised zygotic hypocotyls had the strongest potential to produce callus. Callus induction was also affected significantly by media and PGRs. The proper callus induction condition was MS1/2 medium containing NAA 1mg/L, IBA 10mg/L, BA 2-5mg/L and TDZ 0.05mg/L. Harvest period affect somatic embryogenesis significantly. Zygotic embryo explants collected from the end of July to the middle of August had strong potential to generate somatic embryos, when endosperm finished solidification, different parts of the embryos were completely formed, the size of embryos occupied about 2/3 of the embryo sac. Provided with optimized conditions, direct somatic embryogenesis rate can attain to 33. 68%, and callus induction rate of hypocotyls was up to 90.7%. Cytological observation on megasporogenesis and zygotic embryogenesis of Manchurian ash showed that the ovary was twicarpellum, twilocular with two ovules each loculus. The ovule was tenuinucellar and anatropous, with one megasporcocyte. The development of embryo sac is of the Polygoum type.

体细胞胚胎发生研究的结果表明：(1)成熟过程中的合子胚是诱导水曲柳体细胞胚胎发生的最佳外植体材料；(2)在所试验到的MS、MS1/2（将MS的所有成分均减半）、WPM、DKW、B〓、SH等六种基本培养基中，MS1/2是最适合诱导水曲柳体细胞胚胎发生的基本培养基；(3)水曲柳的体细胞胚胎发生以直接发生为主，体细胞胚主要来自于从合子胚分离的完整子叶；(4)培养基中的激素组合对水曲柳的体细胞胚胎发生有显著影响，诱导直接体细胞胚发生较好的激素组合有NAA 1mg/L+IBA 2，5，10mg/L+BA 10mg/L+TDZ 0.05mg/L和NAA 1mg/L+IBA 10mg/L+BA 0，2mg/L+TDZ 0.05mg/L；(5)合子胚分离的下胚轴具有最强的愈伤组织诱导潜力，少数愈伤组织可以分化出体细胞胚；(6)愈伤组织的诱导也受培养基和激素配比的显著影响，最适宜诱导的培养条件为MS1/2+NAA 1mg/L+IBA 10mg/L+BA 2，5mg/L+TDZ0.05mg/L；(7)采种时间对体细胞胚胎发生有显著影响。7月末到8月中旬的合子胚具有较强的体细胞胚发生潜力，此时种子尚未成熟，胚乳已呈固态，种胚的各个部分已分化完全，种胚体积占胚腔的大约2/3；(8)在各自综合的最适条件下，完整子叶的体细胞胚诱导率可达33.68%，下胚轴的愈伤组织诱导率可达90.7%。

The women who were now standing about the prison-door stood within less than half a century of the period when the man-like Elizabeth had been the not altogether unsuitable representative of the sex.

当时在牢门附近站着的妇女们，和那位堪称代表女性的男子气概的伊丽莎白相距不足半个世纪。

The women who were now standing about the prison-door stood within less than half a century of the period when the man-like Elizabeth had been the not altogether unsuitable representative of the *.

当时在牢门附近站着的妇女们，和那位堪称代表女性的男子气概的伊丽莎白①相距不足半个世纪。

Current price drops of maximum price period be less than a half.

目前的价格下跌到最高价时期的不到一半。

This article, through summarizing the progresses in the evapotranspiration (ET0) methods research, analyzes representative ET0 computation methods emphasized on three periods of the world: modificative Penman, Penman-Monteith and standard ASCE-PM. We take 20th century 90's last stages and 21th century initial period's world newest 19 experimental achievements with lysimeter's actual value rating ET0 value as the foundations, analyzing general usage of the ET0 computational method regarding the different climatic conditions. Although the effect of PM method application is desirable in many areas, many local effects are still unsatisfactory; the method MP and so on are more suitable in part of areas; the PM and MP method are not popular, the special attention must be paid to the standard ASCE-PM method. In brief, these kinds of half theory (semi-empirical) methods only suit in certain areas.

通过对ET0计算公式研究进展的总结，分析了在世界上三个时期比较有代表性的计算蒸发腾发量(ET0)的主要公式：修正Penman公式、Penman-Monteith公式及标准ASCE-PM公式；以20世纪90年代末期和21世纪初期世界上最新的19个用Lysimeter实验值率定ET0计算值的实验成果为基础，对于不同气候条件下ET0计算方法的普适性分析评估认为：虽PM公式应用效果较好的地区较多，但也有不少地区效果欠佳，MP等公式在一部分地区较好，PM与MP公式并非普适性的，要特别关注标准ASCE-PM公式，总之，这类半理论公式均有一定的地区性。

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。