中国大学MOOC: The pressure vessel in a boiler is usually made of steel (or alloy steel).
中国大学MOO
C、 The pressure vessel in a boiler is usually made of steel (or alloy steel).
发布时间：2025-07-06 19:42:46
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答案：锅炉的压力容器通常是用钢材（或合金钢）加工而成。锅炉的压力容器通常是由钢材（或合金钢）加工而成。
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