A bag filled with sand and used as ballast, in the formation of protective walls, or as a weapon.

The ballast and junction box is selected by user.

镇流器、接线盒由用户选择。

The ballast junction box and the high of lamp-post can be matched by users'choice;

镇流器，接线盒及灯杆高度可由用户选择；

When the high pressure mercury lamp, high pressure sodium lamp and Matallic Halide lamp is selected by custom who need equip relevant flameproof ballast box.

用户采用高压汞灯、高压钠灯、金属卤化物灯光源时，须配套相应的隔爆型镇流器箱。

To design thickness of ballast bed is based on the required strength of track structure and partly the experience in national railway.

现行的地铁设计规范对道床厚度的选择仅根据轨道强度要求和国铁的经验确定。

The Low Cost Wide-Sleeper Ballast Bed Track with Damping Rubber Bits

廉价减振型宽枕碎橡胶道床轨道

Study on adjusting track irregularity of integrated ballast bed in urban elevated railway

高架铁路整体道床轨面不平顺调整的研究

Construction Precision Control of Chord Surveying Method for Ballastless Track Ballast Bed

无碴轨道道床竖曲线弦测法施工精度控制

Construction Method for Lower Part Work of Ballast Bed in Overhaul of OCS

石质路基区段接触网下部工程大修的施工方法

Test Analysis on the Quality State Parameter of Newly-Built Railway Ballast Bed

新建铁路道床质量状态参数试验分析

Construction technique for ballast bed on high speed railway

高速铁路有碴道床施工工艺的探讨

Calculations and Design of a Water-Cooled Ballast Variable Resistor for Strong Current

强流水冷镇定变阻器的计算和设计

The effect of wave crest coefficient on lamp lifetime is studied experimentally. Based on the study, an improved circuit is designed with the result of better performance of electronic ballast resistor.

由实验中测出不同的灯电流波峰系数与灯开关次数的对比结果，说明了灯电流波峰系数偏高对灯寿命的影响，从而推出一种高性能低成本的电子镇流器。

Unclip ventilation hose and ballast resistor.

旋开通风软管和镇流电阻器。

The main discharge and output power of the laser are controlled by applied preionization pulses. The laser can operate free of ballast resistor.

激光器的主放电和输出功率由外加的预电离脉冲控制，可省去限流电阻。

The direct current output characteristics of the main supply and the selection of the ballast resistor greatly affect the glow discharge stability and the output power.

主电源直流输出特性及限流电阻选择对放电稳定性及功率输出影响很大。

Its stable and even discharge makes the ballast resistor smaller which reduces extra power consumption.

其放电均匀稳定，可减小限流电阻值，降低外电路电功损耗。

Flash LED current is set via a ballast resistor.

闪光LED电流通过镇流器电阻设置。

There were also about 10% savings of power in ballast condition.

在压载状态下也可获得10%左右的节能效益。

Typical application of gravity immersion in ballast water system

重力浸水在压载水系统中的典型应用

Several Problems Concerning Sampling and Monitoring of Organisms in Ballast Water

船舶压载水中生物取样和检测的几个问题