From Paragraph 2, we can learn that ______.
A.the airline agents are generally under pressure of work
B.the airline agents are lazy people
C.the airline agents must be forced to work hard
D.all the employees will not find it unbearable to be monitored by computer
第5题
稀有碱基在哪类核酸中多见()
A、mRNA
B、rRNA
C、tRNA
D、核仁DNA
E、线粒体DNA
第7题
稀有核苷酸主要存在于下列哪种核酸中
A、mRNA
B、rRNA
C、tRNA
D、DNA
E、以上都不是
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