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| 1. | The stainless tubing is less likely to kink than copper, but it is harder to solder without an acid treatment. |
| 不锈钢管比铜管不易纠结，但不经酸性处理焊接较困难。 |
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| 2. | The leads from the model are most easily made of plastic tubing, which has little tendency to kink or leak and has good bending qualities. |
| 做为从模型引出的导管以塑料管为最方便，用塑料管不会纠结和漏气而且弯曲性能好。 |
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