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The precipitation hardening processes include（）heat treatment and（）heat treatment.
The precipitation hardening processes include（）heat treatment and（）heat treatment.
正确答案：solution precipitation
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材料概论
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Metal corrosion can be calssified according to the two major processes by which it occurs.One is（）直接氧化corrosion，the second process is（）电化学 corrosion
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The matrix is the binder material that（）the fibers.