Because drewrad resins are photoactive , photoinitiators are optional 因为drewrad树脂是光活性的，光引发剂只是选择性的。
2.
Because drewrad ? resins are photoactive , photoinitiators are optional 因为drewrad ?树脂是光活性的，光引发剂只是选择性的。
3.
The iron doped tio2 thin films showed almost no photocatalytic activity for the photodegradation of no in the gaseous phase when the calcination temperature was lower than 400 c . this was due to the fact that the phase structure of the film was amorphous . at 400 c , the film appeared obviously photoactive du 对于用液相沉积法所制备的tio :薄膜，薄膜中的si (或fe )含量和薄膜的厚度可通过调节前驱体浓度、溶液的ph值、基片的沉积温度和沉积时间，薄膜的热处理温度和时间进行有效地控制。
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