如果阀体的材料是可以焊接的，但膨胀系数差异很大，或者工作温度的变化幅度范围较大，螺纹连接部必须进行蜜封焊。
If the valve body material can be welded, but very different thermal expansion coefficient, or changes in operating temperature range of a larger thread junction closure weld must be honey.
由不胀钢制成非常低膨胀系数的样品载台保证温度变化对样品的位置没有影响。
A very low linear expansion coefficient sample carrier made from invar ensures that temperature change has no effect on the sample position.
可装低温液体进行低于环境温度的线膨胀系数测试试验。
Can be installed in cryogenic liquid is lower than the environment temperature linear expansion coefficient test test.
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