Non-uniform settlement of the part of building ( box culvert ) crossing the levee of Dongting-lake appears in its usable life affects its operation and even leads to rupture .

洞庭湖部分穿堤建筑物（箱涵）运用 期间发生不均匀沉陷，影响运行甚至破损断裂。

Seeing that water shutoff agents of polyacrylamide-chromium gel type used at home have many shortcomings such as short pumpable time and usable life it has been suggested to substitute thiourea dioxide for sodium thiosulfate in the formula of chromium gel system as a reducing and initiating agent .

针对目前国内使用的油井堵水剂聚丙烯酰胺铬凝胶存在可泵入时间短、堵剂用量小及 有效 期短等缺点，提出用二氧化硫脲代替铬凝胶配方中的硫代硫酸钠作为还原引发剂。

The analysis and result of simulation are useful to optimize the packaging of high-power supply module and enhance the usable life of it .

仿真结果与分析对优化电源模块封装技术、提高模块的 使用 寿命，具有一定的指导意义。

It was observed that the catalytic activity and the usable life of the treated niobic acid for synthesis of diethylene glycol dibenzoate was apparently higher than that of the untreated niobic acid .

用于催化酯化合成二甘醇二苯甲酸酯增塑剂，处理后固体铌酸的催化活性和 重复 使用 寿命有明显提高。

The material can be changed reversibly from yellow to reddish orange at 110 ℃ and has good temperature response and long usable life .

该热变色材料在110℃温度下可由黄色变为橙红色， 变色灵敏，可逆重复性好。