单项选择题
鸟嘌呤和胞嘧啶之间联系是由两对氢键形成
A.对
B.错
鸟嘌呤和胞嘧啶之间联系是由两对氢键形成
A.对
B.错
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单项选择题
Besides a lack of visual effects, what is mentioned as another weakness of radio ads
Besides a lack of visual effects, what is mentioned as another weakness of radio ads
A.Radio advertising time is limited
B.The audience is limited
C.Radio ads are too expensive