Repair lower voltage equipments and power transmission includes tank farm pumps, main workshop and fire fighting water pump. Regular test motor and distribution cabinet insulation.

维修低压设备和给低压设备停送电，包括罐区的泵、主车间泵和消防泵泵。定期测试电机和配电柜的绝缘。

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A new propeller model open - water test was carried out in the decompressible towing tank .

本文介绍了在减压拖曳水池中最新开发的桨模敞水试验技术。

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You can let the tank go for awhile and not dose to purge any excesses that might have built up over a month or two or you can test to see rather than do the water change.

过一段时间后养料可以不用添加，因为前期可能有过量营养积累在缸中，此时不用管，也不需要换水。

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