The invention of chopsticks()the wisdom of Chinese ancient people.
A、deflects
B、reflects
C、conflicts
D、relicts
A、deflects
B、reflects
C、conflicts
D、relicts
A、 ClCH2CHO,CH3CH2CHO,PhCHO,PhCOCH3 B、 ClCH2CHO,PhCHO,CH3CH2CHO,PhCOCH3 C、 PhCHO,ClCH2CHO,CH3CH2CHO,PhCOCH2 D、 CH3CH2CHO,PhCHO,ClCH2CHO,PhCOCH3
A、CH3COCH2CH3,CH3CHO,CF3CHO,CH3COCH=CH2 B、 CH3CHO,CF3CHO,CH3COCH2CH3,CH3COCH=CH2 C、 CF3CHO,CH3CHO,CH3COCH=CH2,CH3COCH2CH3 D、 CF3CHO,CH3COCH=CH2,CH3CHO,CH3COCH2CH3
A、the raising of the standards of teaching and the reform in curriculum B、the raising of the standards of teaching and learning and the restructuring of the schools C、the raising of the standards of teaching and the improvement of the standards of learning D、None of the above