环境污染属于私人负外部性。
参考答案:错
With a lot of problems ____, the manager had a hard time. [ ]
A. to settle
B. settled
C. having settled
D settling
急性化脓性感染病人外周血白细胞增加的原因为()
A.组织细胞破坏吸引中性粒细胞趋化
B.中性粒细胞提前释放
C.中性粒细胞异常分布
D.细菌、补体等刺激中性粒细胞趋化
E.中性粒细胞异常增生