题目内容
固溶体的强度和硬度比溶剂金属的强度和硬度高。
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常温下，金属的晶粒越细小，金属强度、硬度越高，同时塑性、韧性越好。
Americans come ____all different colors and nationalities.
Millions of immigrants came to the United States from all corners of the world ____their own culture and values.
Although Americans do not always agree ____each other, they are united by a very special thing.
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