选择给水用管道的原则是：物理机械性能良好，强度高，保证连续、安全、可靠供水；
The criteria of pipe selection include good physical and mechanical properties, high intensity, and sustaining and water supply reliable.
采用新型高活性聚合物多元醇GPOP-H45为原料，制备出机械性能良好的高回弹泡沫制品。
The high resilient foams with good mechanical properties were prepared by using novel high active polymer polyol GPOP-H45 as raw material.
本 实用新型光束模式好，金属零件加工后机械性能良好、尺寸精度和表面光洁度 高，适用范围广。
The utility model has good beam mode, good mechanical properties of the metal parts being processed, high dimensional accuracy and high surface finish quality.
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