调低jack支撑高度,一来支撑减重二来防止万一的垮塌,木头的高度正好,如果是在坡道干活更是比stand优越安全。
调低jack支撑高度,一来支撑减重二来防止万一的垮塌,木头的高度正好,如果是在坡道干活更是比stand优越安全。
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