Some metals , such as cobalt , nickel , chrome and so on , can corrade the element in high temperature melting state and affect the service life of element
2.
In han culture circle there seems no such weapon with complex pattern on steel , especially in early time . moreover , how to add that pattern ? carve ? corrade
3.
( 7 ) rainfalls can " deposit " the co2 in air , making it to take part in the process of karst , to dissolve and corrade carbonate rock . co2 concentration in soil become lower after heavy rainfall and become higher after general rainfall . ( 8 ) the value of chemical characteristic of soil water in the high elevation area is lower than that in the low elevation area
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