有很好的气密性可在负压下反应方便地组装成蒸馏回流装置。
With very good air-tightness, can conduct reaction under negative pressure and easily assemble distillation, reflow device.
可以工作在正压或负压下，简单的螺丝刀 调节，多种弹簧可选。
They work under pressure or suction. Simple screwdriver adjustment. Various springs available.
从理论上分析了单桶负压下沉过程中土体与桶形基础的相互作用。
The interaction between the soil mass and bucket foundation during the sinking process of a single bucket driven by negative pressure is analyzed.
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