笔者采用量化研究的方法,运用第二语言教学的课堂话语互动理论,选取目前应用最为广泛且公认为设计比较成熟的观察第二语言课堂话语互动的量表——COLT(Communicative Orientation of Language Teaching)量表对三位教师的初级汉语口语课...笔者采用量化研究的方法,运用第二语言教学的课堂话语互动理论,选取目前应用最为广泛且公认为设计比较成熟的观察第二语言课堂话语互动的量表——COLT(Communicative Orientation of Language Teaching)量表对三位教师的初级汉语口语课堂进行观察和描写,分析出对外汉语初级阶段口语课堂话语互动的特点,并针对分析出的问题,提出了在初级阶段促进课堂话语互动,提高学生话语输出水平的策略。展开更多
The frequency of micronuclei (MN) in cells of the nasal mucosa, oral mucosa and in lym-phocytes was evaluated for 25 students in anatomy classes exposed to formaldehyde (FA) overan 8-week period. Each student served a...The frequency of micronuclei (MN) in cells of the nasal mucosa, oral mucosa and in lym-phocytes was evaluated for 25 students in anatomy classes exposed to formaldehyde (FA) overan 8-week period. Each student served as his or her own control. The time-weighted averageconcentration (TWA) of fOrmaldehyde in anatomical laboratories and in students' dormitorieswas 0. 508 ± 0. 299 mg/m3 and 0. 012 ± 0. 0025mg/m3, respectively. A higher frequency ofmicronuclei was observed in nasal and oral exfoliative cells after formaldehyde exposure (3. 85± 1. 48 vs 1 .20± 0. 676 and 0. 857 ± 0. 558 vs 0. 568 ± 0. 317, paired-t test: P< 0. 001and P < 0. 01, respectively). No significant increase in the frequency of lymphocyte micronu-clei was found after formaldehyde exposure (P >0. 05 ). The present study shows that nasalmucosa cel1s exposed through respiration are the chief target of FA-induced genotoxic effects展开更多
文摘笔者采用量化研究的方法,运用第二语言教学的课堂话语互动理论,选取目前应用最为广泛且公认为设计比较成熟的观察第二语言课堂话语互动的量表——COLT(Communicative Orientation of Language Teaching)量表对三位教师的初级汉语口语课堂进行观察和描写,分析出对外汉语初级阶段口语课堂话语互动的特点,并针对分析出的问题,提出了在初级阶段促进课堂话语互动,提高学生话语输出水平的策略。
文摘The frequency of micronuclei (MN) in cells of the nasal mucosa, oral mucosa and in lym-phocytes was evaluated for 25 students in anatomy classes exposed to formaldehyde (FA) overan 8-week period. Each student served as his or her own control. The time-weighted averageconcentration (TWA) of fOrmaldehyde in anatomical laboratories and in students' dormitorieswas 0. 508 ± 0. 299 mg/m3 and 0. 012 ± 0. 0025mg/m3, respectively. A higher frequency ofmicronuclei was observed in nasal and oral exfoliative cells after formaldehyde exposure (3. 85± 1. 48 vs 1 .20± 0. 676 and 0. 857 ± 0. 558 vs 0. 568 ± 0. 317, paired-t test: P< 0. 001and P < 0. 01, respectively). No significant increase in the frequency of lymphocyte micronu-clei was found after formaldehyde exposure (P >0. 05 ). The present study shows that nasalmucosa cel1s exposed through respiration are the chief target of FA-induced genotoxic effects
