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Given: Which two methods, inserted individually, correctly complete the Three class?() ["public void foo() {}","public int foo() { return 3; }","public Two foo() { return this; }","public One foo() { return this; }","public Object foo() { return this; }"]
对首次使用的配合比应进行开盘鉴定,开盘鉴定的内容包括()。 ["混凝土的原材料与配合比设计所采用原材料的一致性","出机混凝土工作性与配合比设计要求的一致性","混凝土强度","混凝土凝结时间","混凝土扩展度"]
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