单项选择题
A.490,294 B.980,294 C.1960,980 D.1960,490
A.浮顶罐 B.拱顶罐 C.锥顶罐 D.悬链式罐
A.48775 B.48763 C.48792 D.48820
A.8 B.8.4 C.8.49 D.8.492
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