能力分析将要利用这个分层来检查供应和需求层次之间的缺口。
The capacity analysis will take advantage of this layering to examine the gap between supply and the layers of demand.
方法：应用分层整群抽样方法，在城市、农村小学中各抽取一所小学，进行视力检查及相关因素调查。
Method: Using stratified cluster sampling, sampling an elementary school respectively in the city and countryside, carries on the check by sight and the correlation factor investigation.
但到目前为止，地质数据的抽样检查基本上采用百分比抽样方案及简单随机和分层抽样方法。
However, percent sampling has been mainly used for sampling inspection of geological data till now.
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