Mechani cal types of relays are made as open or sealed units;
继电器的机械类型要么是敞开的，要么是密闭的；
Because they are exposed to weather and water, make sure your landscape lighting designer USES only weather-sealed units designed for outdoor use.
因为他们受到的天气和水，确保您的景观灯光设计只使用天气密封户外使用而设计单位。
Units with a general accountant should also have their accounting reports signed or sealed by him or her.
在企业单位，应该有高级工程师、工程师，总会计师、会计师等职称。
Units with a general accountant should also have their accounting reports signed or sealed by him or her.
在企业单位，应该有高级工程师、工程师，总会计师、会计师等职称。
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