This enables the shafts to be lowered into the tank and to operate at the normal water level.
这样就可以把轴（从上方）吊入罐内，并在正常水位下操作。
Methods: Standard water tank, normal animal and animal tumor model were used to assess the dosage change before and after a NiTi stent placement.
方法：分别利用标准水模、正常动物和肿瘤模型对镍钛合金支架置入前后的吸收剂量变化进行测量。
They can not only remain tank internal normal pressure, but also prevent over pressure or vacuum in tank reduce liquid volatilization loss in tank.
它不仅能维持储罐气压平衡，确保储罐在超压或真空时免遭破坏，且能减少罐内介质的挥发和损耗。
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