User guide

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O: It means that the concentration of this substance is under the limited concentration of standard
SJ/T11363-2006.
X: It means that the concentration of at least one substance is above the limited concentration of
standard SJ/T11363-2006.（This product meets the standard RoHS of Europe; So far, none technology
for replacing or reducing the concentrations of electric porcelain, optical glass, steel and cooper alloy
exists in the world.）