制约因素

However, during borehole grouting pile construction of the present, round section piles are used universally. Generally speaking, the boreholes are drilled by a large diameter round piling bit. Because of the restriction of factors of the mud pumps, and drilling equipments, and drilling technique, it would result in such problems as fol lowing: a bigger cutting area and overlarge cuttings volume, and more hole bottom sediments, difficult cuttings discharging, and serverely repeat cuttings breaking, and using more concret grouting amount, and lower drilling speed, faster bit wearing, and longer working period, bigger material and labor ex haust, and higher engineering cost, unreasonable ratio of loading capacity to volume of pile foundation, and lower comprehensive economic benefits, and so forth.

然而，钻孔灌注桩施工中，目前最为普遍采用的是圆形断面桩基，一般采用大口径圆形基桩工程钻头，由于国内生产的泥浆泵、钻具及钻进方法等因素的限制，从而使钻孔破岩面积和体积过大，造成孔底沉渣过多，排渣困难且排浆量大，重复破碎问题突出，混凝土灌注量大，直接反映为钻进效率低、钻头磨损快、施工工期长、材料能耗和劳动消耗大、工程成本较高、桩基荷载能力与体积比不合理、综合经济效益不理想等，这些问题严重影响和制约着钻孔灌注桩施工技术的发展和进步。

While the primary has not atmosphere like Luna, it is the gravitational effect that causes the long periodic variation with large amplitude in eccentricity and ends the lifetime with decreasing pericentric distance.

若中心天体无大气，这种机制就成为制约轨道寿命的最主要因素。

Environmental problems, shortages of energy and water and demographic imbalances are other Chinese weaknesses that have long been pored over.

环境问题、能源短缺、水资源和人口分布不均是一直以来是制约中国经济发展的其他因素。

However,as the measures themselves, there was some shortcomings in the implementation precess which was influenced by various factors, making some measures implemented unefficiency.

但由于措施本身还有一定的局限性，在执行过程中又受到一些因素的制约，这使得一些应对措施难以有效实施。

During seed production in hybrid rice, preharvest sprouting is one of the main restricting factors for yield and quality.

在杂交水稻制种生产上，穗上芽的发生成为制约制种产量和品质的主要因素之一。

However,due to the restrictiveness of many auditing environmental elements,a lot of system-functional deficits were remained during this period.As a result,the healthy development o...

但由于受诸多审计环境因素的制约，这一时期的审计人事管理仍存在着一些制度性的功能缺陷，从而限制了审计人事管理制度的健康发展。

Firstly, influenced by climate, topographical feature, soil and hydrological and geographical features, there was drought, flood, salinification, desertification and barren in Daxing, biological protection is necessary as a protective barrier to control sand from Yong Dinghe River bed Secondly, the windbreak system has features of urban forestry with aesthetic character and reasonable forest structure and arrangement.

首先，受气候、地貌、土壤和水文地质等多种因素制约，旱、涝、碱、沙、瘠等自然灾害普遍存在，防护林体系的生态环境保护作用应当得到充分体现，要成为首都&南大门&的生态屏障保护及永定河沙地的风沙源控制带。其次，要体现大城市城郊防护林体系的建设特点，布局合理，结构合理，具有一定的风景美学价值。

These factors are shackling the realization to control tax in law. These problems should be solved through the improvement of tax legalization.

这些因素制约和束缚着依法治税目标的实现，必须通过推进税收法制化进程予以解决。

This passage analysis the status quo of university ideological and political education, the impacts on the practical effect of university ideological and political education from public communication as the breakthrough point, and consult the "gatekeeper" theory, Spiral of Silen...

本文以大众传播对高校思想政治教育传播实效性的影响为切入点，分析了高校思想政治教育传播实效性的现状，并借鉴传播学中的&把关人&理论、&沉默的螺旋&理论和&意见领袖&理论等理论，系统的分析了教育传播因素，包括传播者、受众、传播内容、传播技巧、传播媒介和反馈对高校思想政治教育传播实效性的影响和制约。

Can develop theory to be in just about continuously " environmental crisis " become minatory mankind to live, the direct element that restricts economic progress and influence society stability, the mankind begins to ponder over the relation of person and environment seriously eventually, after having soberer knowledge to a variety of traditional corrupt practice that develop way, put forward.

可持续发展理论正是在&环境危机&成为威胁人类生存、制约经济发展和影响社会稳定的直接因素，人类终于开始认真思考人与环境的关系，对传统的发展方式的种种弊端有了比较清醒的认识后提出来的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。