To increase coverage, this land-line sample was supplemented by respondents reached through random dialing of cellphone numbers. The two samples were then combined.
为了增加覆盖率，除了陆上电话局抽取的样本外，调查者还随意拨打了一些手机号，并把两种样本结合起来统计。
The objective of this dissertation is to develop on-line sample preparation procedures based on membrane extraction and flow injection (FI) techniques.
第二部分研究了几种流动注射（FI）在线样品前处理技术，为FI应用于日常分析提供了新的思路和途径。
The objective of this dissertation is to develop on-line sample preparation procedures based on membrane extraction and flow injection (FI) techniques.
第二部分研究了几种流动注射（FI）在线样品前处理技术，为FI应用于日常分析提供了新的思路和途径。
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