指出从改善弹簧管的材质入手来提高含硫天然气管道用压力表的寿命是不可取的。

It is not advisable to lengthen the pressure gauge service life of sulfurous gas pipeline by improving the material behavior of spring tube.

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现在的车速表大多是电子式的，用LED数码管或LCD即时显示，显示更加直观。

Now the speed table is mostly electronic, use LED digital tube or LCD instantly shows, show more intuitive.

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第二步：用万用表测复合管和LM 4702对散热片的绝缘电阻应无穷年夜。

Step two: measure with a multimeter and LM4702 composite pipe insulation resistance of the heat sink should be infinite.

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