答：“安全用卡”是每个持卡人应知应会的常识。
"How to use card in a safe manner" should be common sense to all cardholders.
简要介绍静电喷粉工的应知应会，只有熟悉应知应会，才能提高操作水平。
This paper briefly introduced the should knowing and should doing of electrostatic powder workers. Only by knowing the should knowing and should doing well can you enhance your operating level.
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