防塞的

The shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer.

带测试旋塞的关闭阀应该安装在防回流阀的进口侧。

The wellhead part mainly includes the controlling device, the pneumatic valve, the blowout control box, the damping spring and the plunger catcher, and the downhole part consist of the combination tubing, the buffer spring, the tubing spider and the plunger which reciprocated between the tubing.

井口部分主要包括控制器、气动阀、防喷盒、减震弹簧、柱塞捕捉器；井下部分主要包括大小油管、缓冲弹簧、油管卡定器，以及在大小油管间往复运动的柱塞。

Based on the analysis of this study, the major counseling and guidance principles are establishing and maintaining good relationship between teacher and student, accepting and advising children, fairness, teacher's words conforming with higher actions, and other counselling viewpoints; the essential principles of adaptation include a positive attitude toward reality, self-directing and hard working, proper combination of toughness and gentleness, survival in distress, and other viewpoints relative to the adaptation of oneself to the external environment; and leadership principles include using normative power, contingency, and the important characteristics associated with leaders.

主要之辅导原理为包容接纳儿童、辅导儿童自导、建立良好的师生关系、至诚、渐进、豫防、境教身教言教并重、动静相济、公平无私、日新其德、变通、仁合於义、与时偕行、只管耕耘不计收获、周而能异、遏恶扬善、益之用凶事、以果行首德、爱而严之教育态度、恒久於其道而天下化成、有德长老之领导、熟练以致用、不可急速正其不正等；主要之适应原理为中且正、亲比、天下随时、包含章美、积极面对现实、敬慎、努力充实自己、自强不息、自我尝试、自求、刚而能柔、柔而能刚、积种倾倒否塞、艰难以处之、内健而外顺、生於忧患、反身修德、利人、至诚、安而不忘危、见几而作等；主要之统御原理为在莅众用晦而明、师出以律、无为、以孚信化邦、以贵下贱、知临、咸感以临下、威临吉无不利未顺命也、变而过之以尽利、在师中吉、劳谦、敬之无咎、长子帅师、容民畜众、君子央央、师或舆尸凶、师左次无咎、慎密、匪其彭无咎、有孚维心亨、作事谋始、圣人感人心、明慎用那而不留狱、先甲三日后甲三日、致命遂志、涣其躬、涣其羣、动而免乎险、上以厚下安宅、思不出其位等。

The results indicate that the thermal stress and comprehensive stress of 6Aa dam section and F6 fault concrete tuck during construction and operation are all within the allowed concrete tensive strength. The results indicate that the construction scheme of 6Aa dam section and the disposal scheme of F6 fault is feasible and meet the need of dam temperature control and crack .prevention.

计算分析表明，施工期和运行期6Aa坝段及F6断层混凝土塞的温度应力、综合应力均未超过该工程碾压混凝土的设计允许抗拉强度，表明6Aa，坝段的施工方案和F6断层的处理方案在温控和防裂方面是可行的。

We've mainly produced many types of marine fittings with a completed list of specifications as per such standards as JIS, DIN ANSI and BS, including flanged valve, cast steel stop valve and angle valve, cast iron stop valve and angel valve , storm valve, fire valve, air plug and filter.

公司主要专业生产经营多种类，规格齐全。主要生产日本标准JIS，以及DIN，ANSI，BS等标准的船用法兰阀门，铸钢截止阀/角阀，铸铁截止阀/角阀，防浪阀，消防阀，闸阀，碟阀及配件等。并且代理美国GRACO气动隔膜泵，气动柱塞泵，高压清洗泵等一系列产品。

We've mainly produced many types of marine fittings with a completed list of specifications as per such standards as JIS, DIN ANSI and BS, including flanged valve, steel stop valve and angle valve, iron stop valve and angel valve , storm valve, fire valve, air plug and filter.

本公司主要生产日本标准JIS。以及DIN，ANSI，BS等标准的船用法兰阀门，铸铁截止阀/角阀。铸钢截止阀/角阀，防浪阀。消防阀，闸阀，蝶阀，德标/美标蝶阀及配件等，并且代理美国GRACO气动隔膜泵，气动柱塞泵，高压清洗泵。

We've mainly produced many types of marine fittings with a completed list of specifications as per such standards as JIS, DIN ANSI and BS, including flanged valve, cast steel stop valve and angle valve, cast iron stop valve and angel valve , storm valve, fire valve, air plug and filter.

本公司主要生产日本标准JIS。以及DIN，ANSI，BS等标准的船用法兰阀门，铸铁截止阀/角阀。铸钢截止阀/角阀，防浪阀。消防阀，闸阀，碟阀，德标/美标蝶阀及配件等，并且代理美国GRACO气动隔膜泵，气动柱塞泵，高压清洗泵。

The downhole milling pipe string of screw drill tool will produce great reverse torque while milling and grinding the bridge plug, cement plug and so on, and which is extremely harmful to the screw drill tool .

针对螺杆钻具磨铣钻削井下桥塞、水泥塞及类似钻削工作中管柱在井下所产生的巨大反扭矩的危害，在对磨铣钻削管柱进行受力分析的基础上，提出了改进方案，即&井下防扭装置&和&磨铣钻削管柱的配置&，有效地降低了反扭矩带来的危害，改善了磨铣钻削管柱的受力状况。

According to the working principle, we design the structure of the supporting devices, such as blowout control box, the tubing spider and the two plungers, and has carried on the corresponding design calculation to the big and small plunger's disengagement way and the structure.

结合接力式柱塞举升的工作过程，对其配套装置（防喷盒、卡定器、大小柱塞等）进行了结构设计，并对大小柱塞的脱接方式及其结构进行了相应的设计计算

Anton Auer Engineering Technology Co., Ltd. ceramic upcoming special pumps, will greatly enhance plunger pump sand, anti-scaling, anti-wear, high temperature performance in several respects.

安东奥尔工程技术有限责任公司即将推出的陶瓷特殊泵，将会大大提高柱塞抽油泵防砂、防垢、抗磨、耐高温几方面的性能。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。