单项选择题

一普通V带传动装置，工作时有300r/min和600r/min两种转速，
若传递的功率不变，则该带传动应按600r/min进行设计。
A、正确
B、错误

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单项选择题

真核生物mRNA多数在5‘端有（）
A. 多聚腺苷酸尾巴

B. 帽子结构

C. 终止密码子

D. 其余都不对

For the traps that have been drilled, the Class I traps in the evaluation of trap geological confidence refer to the traps that are reliable and have favorable geological conditions for accumulation, which can provide preparatory prospecting.

答案：错误