請(qǐng)問(wèn)這句話什么意思
The functionalized particles were then centrifuged for 30 min and then re-dispersed in 2-propanol (2 × 30 mL) and ethanol (1 × 30 mL) and then centrifuged again in order to remove unreacted carboxylic acid。請(qǐng)問(wèn)這里面2×30 和1×30是什么意思？
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第一個(gè)是分兩次，每次30mL，第二個(gè)是就一次，用30mL酒精，
n*就是重復(fù)n次的意思
贊同第一個(gè)應(yīng)助者的理解！