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fcu，0=fcu，k-tσ（t＜0） fcu，0=fcu，k+tσ（f＜0） fcu，0=fcu，k fcu，0＜fcu，k
ballast water boiler water bilge water sewage water
with dirty water with clean water by oily water by mixed water
by cooling sea water by heating sea water by evaporation of sea water by purifying sea water
fcu，0=fcu，k-tσ(t＜0) fcu，0=fcu，k+tσ(t＜0) fcu，0=fcu，k fcu，0cu，k
fcu,0=fcu,k-tσ(t＜0) fcu,0=fcu,k+tσ(f＜0) fcu,0=fcu,k fcu,0＜fcu,k
sea water temperature must never be warmer than 40 ℃ jacket water pressure should always be greater than the sea water pressure jacket water temperature must always be less than 60 ℃ jacket water pressure must always be less than the sea water pressure
water colours in water colours paint in water colours painting in water colours
Cooling water is alkalescence cooling water is acidity cooling water has salinity cooling water has impurity
Cu2+/Cu+＜Cu2+/CuI＜Cu2+/CuBr＜Cu2+/CuCl； Cu2+/CuI＜Cu2+/CuBr＜Cu2+/CuCl＜Cu2++/Cu+； Cu2+/Cu+＜Cu2+/CuCl＜Cu2+/CuBr＜Cu2+/CuI； Cu2+/CuCl＜Cu2+/CuBr＜Cu2+/CuI＜Cu2+/Cu+。
（—）Zn | Zn2+|| Cu2+ | Cu （+） （—）Zn2+| Zn || Cu2+ | Cu （+） （—）Cu2+| Cu || Zn2+| Zn （+） （—）Cu | Cu2+ || Zn2+ | Zn （+）
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