trace amount

短语词组

短语

• trace amount of cobalt 痕量钴
• trace amount element 痕量元素
• trace amount of bromide 微量溴离子
• trace amount of lead 痕量铅
• trace amount of water 痕量水
• trace amount of calcium 微量钙
• trace amount of cyclohexane 微量环己烷
• trace amount of nitrogen 微量氮含量
• trace amount phenol 微量酚
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