Instead of surface sacrificial layer and bulk micromachining technique, using polymer as thermal isolation material decreases cost and improves yield.
以聚合物材料作为绝热材料，避免了表面牺牲层工艺和体加工技术，降低了成本、提高了成品率。
The bulk sampling discussed in this paper is primarily interested in estimating the mean quality of the bulk material with reasonable cost, so as to adjust the price and process duly when necessary.
散料抽样的目的是为了对总体质量进行估计，以方便定价或进行生产质量控制等。
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