Usually select the vacuum pump is higher than that vacuum equipment vacuum half to one order of magnitude.

通常选择泵的真空度要下于真空设备真空度半个到一个数目级。

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Usually select the vacuum pump is higher than that vacuum equipment vacuum half to one order of magnitude.

通常选择泵的真空度要下于真空设备真空度半个到一个数目级。

youdao