A.50PPM,100-200PPM,90% B.100PPM,200-300PPM,75% C.50PPM,200-300PPM,75% D.50PPM,100-300PPM,90%
A.廠區(qū)、化驗室 B.車間、化驗室 C.廠區(qū)、車間 D.車間、成品庫
A.物理性危害 B.生物性危害 C.化學(xué)性危害 D.人為危害