pyrethrins

常见例句

It is mainly pyrethrin (pyrethroid) with 50 percent in the insecticides.
它们多属拟除虫菊酯类农药,占总数的50%25;
A synthetic clear or amber - colored viscous insecticide, C19H26O3, similar to pyrethrin.
丙烯除虫菊酯一种合成的透明或琥珀色粘性杀虫剂，C19H26O3，与除虫菊酯相似
A synthetic clear or amber-colored viscous insecticide, C19H26O3, similar to pyrethrin.
丙烯除虫菊酯一种合成的透明或琥珀色粘性杀虫剂，c19h26o3，与除虫菊酯相似
A synthetic clear or amber - colored viscous insecticide,C19H26O3,similar to pyrethrin.
为了纪念结婚三周年，马克给妻子买了一条琥珀项链。
A method for the determination of six pyrethrins from natural pyrethrum extracts by capillary gas chromatography with FID detector was described.
研究了毛细管气相色谱法定量分析天然除虫菊提取液中6种酯的方法,FID检测,邻苯二甲酸二丁酯作为内标物。
As pyrethrins insecticides were overused to control the insects in the cotton fields，effects on pink bollworm decreased rapidly.However，methylparathion was still effective.
由于防治棉铃虫、棉红铃虫过量使用菊酯类农药，溴氰菊酯等菊酯类杀虫剂防治红铃虫的田间效果近年呈迅速下降的趋势，而甲基对硫磷对红铃虫仍然有效。