vector and its operation
向量及其运算
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This new nozzle is suitable for the bioassay of pesticide efficacy quantitatively against vector pests due to its simple structure and easy operation.
该喷雾头具有结构简单、操作方便等优点，适合卫生杀虫剂室内药效的微量和定量测定。
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