Work period of current is big, copper wire high temperature (550 degrees), if the working section has air exist, copper and oxygen in heating conditions produce copper oxide.
工作段电流大，铜线温度高(550度左右)，如果工作段内有空气存在，铜和氧气在加热的条件下就产生氧化铜。
The high temperature plug agent made mainly from larch tannin is applied to plugging water at high temperature and adjusting section for oil extraction in oil field.
以改性落叶松栲胶为主料研制的高温堵水剂，适用于油田采油用高温堵水、调剖凝胶。
The velocity and temperature distributions are nonuniform on cross section. The velocity is small and the temperature is high close to the pipe wall.
管道横截面上的速度、温度分布不均匀，越接近管壁速度越小，温度越高。
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