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Rigid packets of at least 0.5 tonne each are against a headboard, with the top packets supported by at least 150 mm. What minimum combined rated lashing strength is required?
每包至少0.5吨的刚性货物紧靠前挡板，顶层货物有至少150毫米受其支撑。捆绑装置的合计额定强度至少是多少？
For the rigid packets described, lashings must have a combined rated strength of at least the load's weight when a suitable headboard supports the top packets by at least 150 mm.
刚性货物紧靠前挡板，且顶层货物有至少150毫米受挡板支撑时，捆绑装置合计额定强度至少为货物重量1倍。
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Each packet must weigh at least 0.5 tonne. The usual requirement is twice the load's weight without headboard support, or 1.5 times where only lower packets are supported and the top support is less than 150 mm.
本题适用于每包至少0.5吨的刚性货物。不靠挡板通常需2倍；仅下层受支撑、顶层不足150毫米时需1.5倍，不能省略支撑条件。