trace amount

短語(yǔ)詞組

短語(yǔ)

• trace amount of cobalt 痕量鈷
• trace amount element 痕量元素
• trace amount of bromide 微量溴離子
• trace amount of lead 痕量鉛
• trace amount of water 痕量水
• trace amount of calcium 微量鈣
• trace amount of cyclohexane 微量環(huán)己烷
• trace amount of nitrogen 微量氮含量
• trace amount phenol 微量酚
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