【单选题】The young policeman often looks after that old woman ______.
【多选题】组合创新原理及其技法:组合创新的规律有哪些( )
【单选题】幼儿感知和体验长度守恒时,教室摆出不同长度,引导幼儿观察、判断它们是否一样长,这一做法运用了( )
【单选题】After considering carefully, my plan has gradually come to ________.
【简答题】如图,∠B=∠DEF,AB=DE,由以下要求补充一个条件,使△ABC≌△DEF. (1)_________(SAS);(2)_________(ASA); (3)_________(AAS).