求翻译：电气、液压、气动和气体的连接端及连接器的设计和制造，应能防止accessible的连接器的不正确连接，以及不用工具装卸时所引起的safety hazards。是什么意思？

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electrical, electronic, hydraulic, pneumatic and gas connection port and connector design and manufacturing, should be able to prevent the connector of accessible not connected properly, and not the safety hazards during the loading.

Electricity, hydraulic pressure, air operated and gas coupling end and coupling design and manufacture, ought to be able to prevent accessible the coupling connects not correctly, safety hazards which as well as does not use the tool loads and unloads when causes.

Connection of electrical, hydraulic, pneumatic and gas port and connector design and manufacture, should prevent accessible connectors not connected correctly, and without tools when handling the cause safety hazards.

Balanced wire of the electric potential