顺次

àn wèn tí de qīng zhòng huǎn jí shùn cì chǔ lǐ

按问题的轻重缓急顺次处理

dispose of the problems one by one in order of importance and urgency

shùn cì cāo zuò

顺次操作

perform in sequence

lián hé shùn cì fǎ

联合顺次法

combined sequential method

shùn cì cuì qǔ

顺次萃取

sequential extract