A.K-類害蟲(chóng)B.非害蟲(chóng)C.r-類害蟲(chóng)D.中間型害蟲(chóng)
A.非隨機(jī)分布型B.隨機(jī)分布型C.核心分布型D.嵌紋型分布
A.社會(huì)因素B.寄主作物C.環(huán)境條件D.蟲(chóng)源