SCD developed the first vacuum etching machine in China, with vacuum flood bar in the etching chamber; no pool effect; etching factor is up to 4.0.

SCD开发了中国国内第一台真空蚀刻机，蚀刻室内加装真空水刀，从根本上解决了水池效应，蚀刻因子提高到4。0以上。

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Vacuum system is important to the turbines economy operation, and vacuum tightness is the main factor that affects vacuum of steam turbine.

汽轮机真空是汽轮机经济运行的关键，真空严密性是影响汽轮机真空的主要因素。

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Reliability of the sealed vacuum tube is very important, and the main factor that affects reliability is its vacuum degree.

密封真空管的可靠性尤其重要，影响其可靠性的主要因素是真空度。

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In addition to that, we have that epsilon nought value, remember that's the permittivity constant in a vacuum, and basically that is what we use as a conversion factor to get from units. We don't want namely coulombs to units, we want that will allow us to cancel out in this equation.

这是电子的电荷，此外，我们有epsilon零，记住这是真空的介电常数，这是我们用来转换单位的转换常数,我们不想用库伦单位，我们希望这个可以在方程中约去它。

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