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  3. One of the most common techniques is to add alloying elements that inhibit the corrosion.

One of the most common techniques is to add alloying elements that inhibit the corrosion.

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问题 One of the most common techniques is to add alloying elements that inhibit the corrosion.
选项 A、repulse
B、retain
C、relieve
D、restrain
答案D
解析 这句话的意思是：最常见的一种技术是添加——腐蚀的合金成分。在给出的选项中，repulse“击退，拒绝”；retain“保持，保留”；relieve“减轻，解除”；restrain“抑制，约束”。很明显，空格处应填入选项D。
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