真空开关管一级是可调式，以您的选择，使更多的均匀分布的原料更好的产品质量。
The vacuum level is adjustable to your option, making a more evenly-distributed raw material for better product quality.
真空开关管一级是可调式，以您的选择，使更多的均匀分布的原料更好的产品质量。
The vacuum level is adjustable to your option, making a more evenly-distributed raw material for better product quality.
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