The main material is SS which has high corrosion resistance longevity of service.
主体材料为不锈钢材料耐腐蚀性强，使用寿命长。
Stem material is SS 316 or other material equivalent to body at manufacturers option…
阀杆材料是316不锈钢或其它与阀体相同的材料，由制造商选择。
The article analyses the advantages of English teaching in senior high school under the network environment, as the example of multimedia teaching cla ss in the new English teaching material.
以英语新教材多媒体教学课例，分析说明了网络环境下进行高中英语教学的优势。
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