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在学前教育中,教师身教重于言教,一举一动、一言一行都成为幼儿的榜样。这说明( )
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在现代社会中,作为教育者的幼儿教师角色不包括( )
Many important industrial compounds such as ethanol, acetic acid, organic acids, butanol and acetone were being produced by the end of 19th century by microbial fermentation procedures that were open to the environment.
A new direction in biotechnology came in the 1940s with the introduction of complicated engineering techniques to the mass cultivation of micro-organisms to ensure that the particular biological process could proceed with the exclusion of contaminating micro-organisms.
Thus by prior sterilization of the medium and the bioreactor and with engineering provision for the exclusion of incoming contaminants only the chosen biocatalyst was present in the reactor.
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