There may be a need for retarding growth chemically to keep trees within bounds.可能需要用化学剂抑制生长,使树冠保持在一定的范围内.This invention relates to the field of concrete complex super - retarding water reducers.本发明涉及一种复合混凝土超缓凝减水剂领域.In t...
Such as grain sheet rubber, it play the role of derrick and inflaming retarding.如有纹理的橡胶片, 这种材料可起到防滑、阻燃等功能.There may be a need for retarding growth chemically to keep trees within bounds.可能需要用化学剂抑制生长,使树冠保持在一定的范围内.This inv...