Research and Development of Chemical Agent;
产品研究与开发；
A certain injecting temperature is necessary at the beginning of injecting the chemical agent m.
在启动过程中掺入化学剂的温度对油井生产有一定的影响。
The fan can change the environment temperature without environment pollution caused by chemical cooling agent.
没有化学制冷剂对环境的污染；
The fan can change the environment temperature without environment pollution caused by chemical cooling agent.
没有化学制冷剂对环境的污染；
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