目的是了解微穿孔板在随机入射场或混响场内的吸声特性与垂直入射的关系。
The purpose is to compare and to find the relation of normal and random incidence.
我们也采用穿孔金属板来调整阳光。
门和固定部分的多个部分可由穿孔金属板制成。
The door and parts of the fixed part may be made of perforated sheet metal.
门和固定部分的多个部分可由穿孔金属板制成。
The door and parts of the fixed part may be made of perforated sheet metal.
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