The diisobutyl dicarboxylate was prepared by using acid and isobutanol as material and acid as catalyst.以二羧酸和异丁醇为原料,用硫酸作催化剂,合成二羧酸二异丁酯.Conducting polyaniline ( PANI ) and poly - O - methylaniline ( POT ) were prepared by ...
It would seem more sensible to apply standards flexibly rather than rigidly.灵活地运用标准比死守标准会显得更合情合理。Many writers at this time held rigidly dogmatic views.这时期有很多作家固执己见。She stood rigidly and stared into the room.她直直地站在那里，凝视着屋...