pyrethrin i造句

例句与造句

1. Unfortunately, insecticidal soap doesn't taste very good, and pyrethrin is poisonous.
2. It is related to the pyrethrin I and II, as well as the pyrethroids.
3. Although pyrethrin is a potent insecticide, it also functions as an insect repellent at lower concentrations.
4. Processing the flowers to cultivate the pyrethrin is often a lengthy process, and one that varies from area to area.
5. The structures of the natural insecticides pyrethrin I, R = CH 3 and pyrethrin II, R = CO 2 CH 3.
6. It's difficult to find pyrethrin i in a sentence. 用pyrethrin i造句挺难的
7. The active ingredients are extracted with organic solvents to give a concentrate containing the six types of pyrethrins : pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmolin I, and jasmolin II.
8. A common formulation of pyrethrin is in preparations containing the synthetic chemical piperonyl butoxide : this has the effect of enhancing the toxicity to insects and speeding the effects when compared with pyrethrins used alone.