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√
21.
Burning behavior asks commonly
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22.
Of specific element migratory (divide modelling clay and point at dye)
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Note:
(1) routine examines the affirmatory equivalent after allowing to use experience card, swift method undertakes.
(2) affirms examine should undertake by standard regulation. Affirm examining the smallest frequency second it is every unit 1 times / year, undertake affirming examining to the product of a model at least every time. Affirm when examining, if the factory does not have test equipment, can entrust the inspection agency that has aptitude / lab undertakes.
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