At present, the sacrificial anode materials used for the protection of iron and steel, which are based of aluminum, zinc and magnesium alloy.

目前常用的保护钢铁设备的牺牲阳极材料有铝基合金、锌基合金和镁基合金三大类。

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Special keel is divided into PVC and Aluminum Alloy two materials, the main ingredient is PVC soft structure, soft buckle edge is made from PVC with some special additives.

专用龙骨分为PVC和铝合金两种材质，软膜的主要构造成份是PVC，软膜扣边也是由PV C以几种特殊添加剂制成。

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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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The Executive represents a new distinctive, sophisticated design for the Beats By Dr. Dre brand that focuses on craftsmanship using premium materials such as aluminum alloy, stainless steel and leather.

ENGADGET: Beats By Dre launches Executive noise-cancelling headphones, keeps 'em dapper in aluminum for $300 (ears-on)