下面那项是没有呈现预防性控制的固有风险？
Which of the following presents an inherent risk with no distinct identificable preventive controls?
引入了“预防性控制”这一新概念，介绍了其实现方法及需要研究的问题。
We present a new concept of "Preventive control", and give some congestion control schemes and further research problems in ATM networks.
预防和控制血吸虫病的基础是，开展预防性治疗，灭螺，改善环境卫生，并进行卫生教育。
Prevention and control of schistosomiasis is based on preventive treatment, snail control, improved sanitation and health education.
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