Sash cables shall be constructed from sturdy material. A steel wire and sprocket system is preferred for its strength and durability.
移门铰链由坚固的材料构成。一般为钢铰链和链齿轮。
Sash cables shall be constructed from sturdy material. A steel wire and sprocket system is preferred for its strength and durability.
移门铰链由坚固的材料构成。一般为钢铰链和链齿轮。
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