A.昆蟲(chóng)病原線蟲(chóng) B.微孢子蟲(chóng) C.變形蟲(chóng) D.錐蟲(chóng)
A.細(xì)顆粒物 B.無(wú)毒顆粒物 C.可吸入顆粒物 D.空氣動(dòng)力學(xué)直徑小于或者等于2.5微米的大氣顆粒物(氣溶膠)的總稱(chēng)
A.10% B.20% C.30% D.40%