The use of disposable syringe, first check is?

Disposable syringe, the name of the product shelf life, and have the approval number and registered trademark, the approval number must be a national agency at the provincial level. Then knead by hand under, see if there is any air leakage, the leak is contaminated items, banned.. And save, see which is which one to use for my own use to, don't blind to use oh...
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