After 24 h tested, the LC 50 values of SV 1 with mixtures fenvalerate and DDVP were 1 7, 1 7, 2 0 and 1 3 times higher than that of the mixture of fenvalerate and DDVP to several pests, respectively.是什么意思_After 24 h tested, the LC 50 values of SV 1 with mixtures fenvalerate and DDVP were 1 7, 1 7, 2 0 and 1 3 times higher than that of the mixture of fenvalerate and DDVP to several pests, respectively.在线翻译_英语_读音_用法_例句