\(f\) is continuous (preimages of open sets are open),
关于推进农业绿色发展，农业农村部表示将强化政策引导，完善工作机制，推进绿色高效品种创新，加快绿色技术推广应用，持续推进农药科学施用增效，强化科学安全用药培训和指导服务。生态环境部将指导地方开展农业面源污染调查、监测和评估，推动因地制宜采取措施。
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