Based on "two-microphone" method, a sound intensity measurement was carried out towards a vehicle four-stroke gasoline engine in a semi-anechoic room.

运用声强测试技术的双传声器法原理，对一台车用汽油发动机在半消声室内进行了声强测量。

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Active noise control experiments were performed in both a semi-anechoic chamber and an ordinary room.

本文分别在半消声室和普通房间进行有源消声实验。

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