The bonnet and packing box of low temperature service instrument in-line valves shall be extended bonnet type or heat traced, if necessary, to avoid freezing of valve stems.
低温设备仪表在线阀门的阀帽和填料箱应为加长阀帽型或伴热型(必要时)，从而避免阀杆结冰。
Professor Bonnet has been working for many years on molecules of this type.
博内特教授多年来一直在研究这类分子。
Professor Bonnet has been working for many years on molecules of this type.
博内特教授多年来一直在研究这类分子。
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