Cold switching is defined as opening and closing the switch when no current is flowing.
冷切换是指在没有电流流通时开路或闭合开关。
Before closing the switch to allow electric current to flow to the heater, make certain that the heater is full of water and that the cold water inlet valve is open.
在打开电源开关之前，要确保热水器处于满水状态，冷水进水阀门处于开启状态。
To make this well-formed, you would need to switch either the opening tag order or the closing tag order.
要使之格式良好，要么切换开始标记顺序，要么切换结束标记顺序。
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