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- necessary protection ratio 必要保护率
- Compact in size and economical in cost, Watts H560G is necessary protection for every recreational vehicle and home trailer. 外形紧凑，成本经济，美国瓦茨型号H560G对于保护每一辆旅行车和家庭拖车是必要的装置。
- However, we believe that diving sewage pump system is set up the necessary protection, it can effectively protect the safe operation of pump. 可是我们认为，在潜水排污泵中设置保护系统很有必要的，它能有效地保护电泵的安全运行。
- RIVAGE Natural Soap is enriched with olive oil and vitamin E to nourish the skin and give it the necessary protection from harmful environmental influences, leaving it extremely soft and clean. Rivage纯天然死海橄榄油皂，含有丰富的橄榄油和维他命E，可以滋养皮肤，免于外界环境的影响和伤害，使皮肤柔软，洁净。
- In the past, the IPO, in addition to allow the issuer to maximize outside financing for small and medium-sized investors, especially for the interests of investors lack the necessary protection. 因为以往的IPO，除了让发行人最大化地融资之外，对投资者尤其是对中小投资者的利益缺少必要的保护。
- Special paints resistant to phosphate esters are available, but the fluid itself is noncorrosive and provides the necessary protective coating. 特殊涂料耐磷酸盐酯是可行的,但液体本身无腐蚀性,提供必要的保护涂层。
- radio frequency protection ratio 射频保护率
- The necessary protective clothing and equipment for specific jobs e.g. oxy-welding and cutting electric welding must be worn while this work is being carried out. 特殊工种需要着装不同的防护服。例如，氧气焊接与焊割、电焊工工作时，必须穿着特殊的防护服。
- audio frequency protection ratio 声频保护比
- Article 65- 1 During a flood and before floodgates open, a reservoir management agency shall notify all related agencies to take all necessary protective measures. 第65-1条(洩洪之通知义务)洪水期间，有闸门之水库洩洪前，水库管理机关应通知有关机关采取必要防护措施。
- The necessary protective clothing and equipment for specific jobs e.g. oxy-welding and cutting, electric welding must be worn while this work is being carried out. 在研磨切片、切割砖块等操作过程中，仅戴安全眼镜是不够的，必须戴上全面罩。也可戴全封闭护目镜。
- For immuned Xzphophorus belleni,the protect ratios of FKC and ECP to homogeneous strain were 60% and 100% respectly. 免疫剑尾鱼中，FKC和ECP组对同源菌株保护率分别为60%25和100%25。
- radio-frequency protection ratio 射频保护率
- It is necessary that he be sent there at once. 有必要马上派他到那里去。
- minimum permissible protection ratio 最小容许防护度
- protection ratio from interference 干扰保护比率
- adjacent channel protection ratio 相邻信道防护比
- signal interference protection ratio 信号干扰保护比
- Is it necessary for me to attend the meeting? 我真的必须参加这个会议吗？
- She will make necessary arrangements. 她会作好必要的准备。
