1. The additives used in the laboratory are required to be exchanged once a week;

2. The solid additives used shall be kept dry and loose. In case of moisture and caking, they shall be collected from the additive room again, and the weighing range shall be accurate to ± 0.01g.

3. Before taking all liquid additives, you must see the purchase date (i.e. shelf life), shake them evenly when taking them, and expired additives cannot be taken.

4. The weighing AIDS shall be kept clean and free of water.

5. Dangerous additives and articles shall be collected by special personnel.

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