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Question:

When the curtain is running, the hook will shake

When the curtain is running, the hook will shake, and then it will make a sound

Answer:

The distinction between the two is in the period of ` ` ` wire traction power, can not be used, ` ` ` belt traction during a power outage, you can pull.
Electric rail commonly used in the family is divided into two kinds: one is ` ` ` ` this ```{wire traction cheaper} is a price comparison in the ``{traction belt on}``
Electric rail ` needs a retractable motor connected with a power supply plate there is a ` ` ` ` ` ` `

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