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【单选题】
下列哪种作用是以DNA为靶的化学诱变作用A.
对有丝分裂作用的干扰
B.
对DNA合成酶系的破坏
C.
对DNA复制酶系的破坏
D.
以上都不是
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【单选题】Just watch a child in a first encounter with a flower or an ant — there is instant interest and fascination. We condition them out of it. 下面那句话里的condition 和题目中的condition 意思相似?
A.
The car has been well maintained and is in excellent condition .
B.
What I buy is conditioned by the amount I earn.
C.
Women were conditioned to expect lower wages than men.
D.
The police released him on condition that he return the following week.
【单选题】The wooden house is still in excellent condition ______ it was built over 100 years ago.
A.
since
B.
because
C.
despite
D.
though
【简答题】施工准备工作的基本任务是了解施工的客观条件,根据工程的特点、进度要求,合理安排施工力量,从( )、( )、( )和施工组织等方面为工程施工创造一切必要的条件。
【简答题】How old is “old”? The answer has changed over the years. Two Hundred years ago, you were old at 35. At the beginning of the 20th century, the average life span (平均寿命) was 45. In 1950, 70-year-olds wer...
【单选题】关于天体和天体系统的说法正确的是 [ ]
A.
天体是宇宙中各种物质的通称，其体积和质量都大于或等于月球，小于或等于太阳
B.
所有天体都相互吸引、相互绕转，处于不断运动之中
C.
总星系是目前人们所能观测到的宇宙部分
D.
银河系的中心部分是河外星系
【简答题】How old is “old”? The answer has changed over the years. Two hundred years ago，you were old at 35.At the beginning of the 20 th century，the average life span（平均寿命）was 45. In 1950，70-year-olds were re...
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