先

This paper introduces different mechanical rod break-out modes,their structures,characteristics and operating programs of top-drive power head drill.

介绍了动力头式钻机的几种机械卸扣方式及其结构特点、操作程序，其中包括先卸钻杆下扣的上扣防松器、活动提篮上扣防松装置以及先卸钻杆上扣的上垫叉座装置。

The contents of chlorophyll and soluble protein decreased continuously in both CMS and their maintainer; while the contents of soluble sugar, praline and the activities of three protective enzymes at first increased, then decreased under cold-stress.

随着低温处理时间的延长，不育系和保持系叶绿素和可溶性蛋白质含量一直下降，可溶性糖和脯氨酸含量呈现先上升后下降的趋势；SOD、POD和CAT活性呈现先上升后下降的趋势。

Some metaphysicians contend that the relation between the lump and the statue, on the one hand, and the relation between Tib and Tibbles, on the other, cannot be fully understood in terms of the concepts of parthood and identity, but require a further concept, a non-mereological concept, the concept of "constitution": the pre-existent lump at a certain point in time comes to constitute the statue (or a certain quantity of gold or certain gold atoms that first constituted only the lump come to constitute them both); pre-existent Tib at a certain point in time comes to constitute Tibbles (or certain cat-flesh or certain molecules …).

一些形上学家承认在金块和雕像之间、Tib和Tibbles之间的关系，这些关系不能完全根据"parthood"和" identity"的概念进行理解，而必须要一个进一步的概念，一个non-mereological的概念，"构成"的概念：先在存在的金块在时间中的某个点构成了雕像（或，一定数量的金子或金粒子首先构成了金块，继而构成了这两个。）先在的Tib在某个时间点开始构成了Tibbles（或某些确定的猫肉、粒子等等）。

This is the experimental operating system scheduling algorithms, including time-rotate, Pree...

这是操作系统实验的调度算法，包含时间片轮转法，抢占式优先权算法，非抢占式优先权算法，先来先服务算法，短作业优先调度算法。

For example, federal statutes might explicitly preempt, or explicitly waive any preemption of, state law.

例如，联邦法律可以明确的先占，或明确的取消州法律的先占。

For example, federal statutes might explicitly preempt , or explicitly waive any preempt ion of, state law.

例如，联邦法律可以明确的先占，或明确的取消州法律的先占。

To impress favorably in advance.To preoccupy the mind of to the exclusion of other thoughts or feelings.

使先充溢脑海中先具有了某种想法或感情，从而杜绝了其他想法

The ancient literature materials are very rare, such as the water-control story of Gun and Yu, the story of Houyi, Xie (the primogenitor of Shang, a name of an ancient kingdom), and the history from Xie to Tang of the Shang Dynasty (17th century - 11th century), however, Tianwen offers much especially valuable hints in this respect.

关于后羿的传说所提的问题，涉及到后羿射日，射河伯而妻雒嫔，最后被寒浞杀害等细节。关于商的始祖契，以及从契到汤的历史，文献资料十分缺乏，而《天问》则提供了很多这方面的线索，其中涉及契、王季、王亥、王恒、上甲微等殷人先公先王的内容，尤其珍贵。

According to the importation of work to create Print Queue 2 3 importation operatio...

昨夜调度程序 1。按输入创建工作队列 2打印输入作业 3。先来先服务 4。按到达时间排序 5。

143 Chapter 1 The History and Future of Computers 3.1.6 Complements To form the radix complement, first find the radix -1 complement, and then add a one to the result.

为得到补码，先求反码，然后将加到结果上加到结果上。为得到补码，先求反码，然后将1加到结果上。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。