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There are two findings summarized from previous studies:(1) the least squares estimator is a common choice of researchers, but under an unequal probability design, the estimator is biased,(2) the probability weighted estimator is consistent but may have a large variance.

过去的研究发现：(1)在不等机率抽样时，一般常用的最小平方法所得到的回归参数估计式并非不偏估计式；(2)机率加权最小平方法可以改善不偏性，然却增加估计的变异程度。

When the item is bidden,we will immediately make preparation for the previous work.

项目中标之后，我们将立即开始前期准备工作。

F. Insufficient frequency of previous screening (eg, failure to be screened at least biennially).

f。之前的筛查不足（如没有至少2年筛查一次）。

F. Insufficient frequency of previous screening (eg, failure to bescreened at least biennially).

f。之前的筛查不足（如没有至少2年筛查一次）。

At the previous ten International Design Competitions held biennially between 1983 and 2001, the objective was mainly to suggest visions and messages

从1983到2001共举办过10次两年一次的国际设计竞赛，竞赛主题主要是以对未来人类环境的表达与诠释为主。

At the previous ten International Design Competitions held biennially between 1983 and 2001, the objective was mainly to suggest visions and messages concerning the future of humankind.

在以往的10届国际设计竞赛中，竞赛目标主要关注人类未来的想象。

Requests the Executive Secretary, when drafting future budget proposals, to present the level of detail provided in the previous biennium and submit the proposals in a timely manner.

请执行秘书在拟订今后的概算时跟以往两年期一样详细，并及时提交概算。

The new director was a big wheel in his previous company,but is not so important now.

这个新主管在他前个公司是个大人物，但现在不是了。

The new director was a big wheel in his previous company but is not so important now.

这位新主管在他前个公司是个大人物，但现在不是了。

Result］Like most of C3 plants, the diurnal changes curve of NPR of Lonicera japonica Thunb. showed double peaks, but there were time difference in reaching the peak value between the study and previous ones. The responding mathematical model of NPR to photosynthetic valid radiation could be described by three mathematic functions , such as logarithm, linearity and binomial,but binomial function was more precise than the others. Light saturation point of Lonicera japonica Thunb. was figured out by binomial equation deduced in the study, and light saturation point was 1 086.3 μmol/(m2·s).

结果］与多数其他C3植物一样，金银花净光合速率日变化曲线呈双峰型，但在具体达到峰值的时间上与前人的结果有差异；金银花净光合速率对光合有效辐射的响应可用对数、线性、二项式3种数学函数来描述，但以二项式描述更确切；根据前面得到的二项式方程，计算出了金银花的光饱和点为1 086.3 μmol/(m2·s)。

In this new architectural plan the Garden of Golgotha came to be at the centre of the new city.

Aelia 是高举他自己，并在此城内朝拜罗马诸神。

The continuous nature of peat accumulation means that terrestrial coaly rocks may provide a higher resolution and more complete record of base-level change than the time-equivalent shallow-marine strata, thus enabling the identification of highfrequency cycles that are not recorded in themarine strata.

泥炭积累的持续性质的手段，陆地coaly岩石可提供较高的分辨率和更完整的记录基准面变化的影响时，相当于浅海阶层，从而使确定的高频周期，不记录在themarine 阶层。