题目内容
诱导系统中的阻遏物是（ ）：
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根据雅各布和莫诺的乳糖操纵子模型，结构基因的表达受控于一个开关单位，这个开关单位称为 ，而这个开关单位是否开放又受到 的控制。
U102 Summary of Text AComplete the following passage with words chosen from this unit. The initial letter of each is given.Many of us these days are learning a foreign language. We are interested in learning another language because we know that knowledge of another language and culture will increase our career opportunities, broaden our horizons and enrich our life. Since learning a foreign language is of such importance, no 1) d__________ people are constantly looking for more 2) e____________ ways of language learning. Most people say the best way to learn a language is to stay in the country where it is spoken. It is true those who go to a native country have an 3) a____________ over those who don't. But living abroad needs money, and not everyone can 4) a__________ to do so. Those who don't go abroad may turn to language schools for help. Language schools usually 5) c__________ that they can teach students to speak the language they want to learn 6) f__________ within 3 to 6 months because they have more 7) q__________ teachers and better facilities, but it would be 8) r____________ to claim that any teacher has discovered a perfect way of teaching English in every possible situation. In fact, there are 9) a__________ many good methods of teaching a language as there are good teachers, because every teacher is an 10) i____________ with his / her own personality. What a student needs to remember then is to find out a method that best suits himself / herself.
破坏下列哪项可作为灭菌指标:
属于专性需氧菌的是:
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