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【单选题】
合成后无需进行转录后加工修饰就具有生物活性的RNA是:( )A.
tRNA
B.
rRNA
C.
原核细胞mRNA
D.
真核细胞mRNA
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反馈参考答案：
举一反三
【单选题】Not until they left school how much their teachers loved them and helped them.
A.
they realized
B.
did they realize
C.
had they realized
D.
they would realize
【简答题】按冒口在铸件位置上分类，主要分为（）冒口与（）冒口之分。
【单选题】Not until they left school ____how much their teachers loved them and helped them.
A.
that they realized
B.
had they realized
C.
when they would realize
D.
did they realize
【多选题】设计学习任务的方法有： （ ）。
A.
分清学习内容的层次结构
B.
对照目标设计学习任务
C.
善于设计“问题导向”的学习任务
D.
掌握学习任务设计的一般方法和特殊学习任务设计的方法
【单选题】在反相色谱法中,若以甲醇一水为流动相,增加甲醇的比例时,组分的容量因子k与保留时间tR的变化为
A.
k与tR增大
B.
k与tR减小
C.
k与tR不变
D.
k增大，tR减小
【单选题】Not until they left school how much their teachers loved them and helped them.
A.
they realized
B.
did they realized
C.
they would realized
D.
had they realized
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