And using the powder trace method to determine the field rat density and calculate the deratization effect.

用粉迹法测定现场鼠密度，计算校正灭鼠率。

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And using the powder trace method to determine the field rat density and calculate the deratization effect.

用粉迹法测定现场鼠密度，计算校正灭鼠率。

youdao