... 高纯度压缩石墨 delaniumgraphite 高压缩比的 VQF 高压缩比泵high compression ratio pump ...
双语例句
1
As the Roots pump is a non-vacuum inside the compression, the compressionratio is usually very low, so high, medium and vacuum pumps need to pump before.
由于罗茨泵是一种无内压缩的真空泵，通常压缩比很低，故高、中真空泵需要前级泵。
2
But there are some shortage of ordinary single-stage heat pump in low-temperature environment, such as highcompressionratio, devoid heating power and low efficiency.