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声楽・合唱に おける ⾶沫感染リスク...Ch2:0.5≦ <1.0 Ch3:1.0≦ <2.5 Ch4:2.5≦ <5.0 Ch5:5.0≦ <10.0 Ch6:10.0≦ ①〜⑩測定点No. 50cm 50cm
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