Nalgene 342020-0500 无菌，PETG 方形有刻度培养基瓶，带盖，聚对苯二酸乙二醇酯共聚物，天然高密度聚乙烯盖，500毫升容量，每箱40 500 mL Media Bottle STERILE Graduated Diagnostics/Packaging 20 40 2380