此外，在紧急情况下可将焊炬上的乙炔胶管拔下来。
In addition, in case of emergency can be acetylene torch on the pull down hose.
所以在常温下，聚乙烯醇水溶液的胶凝会持续数十天或者更长的时间。
At room temperature, PVA would take over ten days or even longer time to gelate.
所以在常温下，聚乙烯醇水溶液的胶凝会持续数十天或者更长的时间。
At room temperature, PVA would take over ten days or even longer time to gelate.
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