調低jack支撐高度,一來支撐減重二來防止萬一的垮塌,木頭的高度正好,如果是在坡道幹活更是比stand優越安全。
調低jack支撐高度,一來支撐減重二來防止萬一的垮塌,木頭的高度正好,如果是在坡道幹活更是比stand優越安全。
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