请问这句话什么意思
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。请问这里面2×30 和1×30是什么意思?
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第一个是分两次,每次30mL,第二个是就一次,用30mL酒精,
n*就是重复n次的意思
赞同第一个应助者的理解!