Indirect materials including Aluminum Alloy keel or PVC keel, buckle strips, fasteners, adhesives, the relative direct cost of raw materials is slightly lower.
间接原材料包括铝合金龙骨或PVC龙骨、扣边条、固定件、粘结剂等，相对直接原材料费用稍低。
Indirect materials including Aluminum Alloy keel or PVC keel, buckle strips, fasteners, adhesives, the relative direct cost of raw materials is slightly lower.
间接原材料包括铝合金龙骨或PVC龙骨、扣边条、固定件、粘结剂等，相对直接原材料费用稍低。
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