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【简答题】
根据三极管结构的不同,有NPN和 两种。
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皮皮学刷刷变学霸
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【简答题】A. take part in B. look for C. keep D. think of E. as soon as possible 1. He wanted to get to Athens ______. 2. What do you ______ the teacher's idea? 3. After class, we often ______ the activity ...
【单选题】下列关于抗体的描述错误的是（）
A.
能与相应抗原特异性结合的具有特定功能的免疫球蛋白
B.
抗体都是免疫球蛋白
C.
在抗原的刺激下，淋巴细胞增值和分化，并分泌抗体
D.
免疫球蛋白都具有抗体活性功能
【单选题】听力原文：W: George, do you know the flood which has caused much damage and destruction is the worst one for half of the century? M: Oh, no wonder the prices of vegetables and fruits arc going up these day...
A.
The heroic fight against the flood.
B.
The prices of vegetables and fruits.
C.
The effects of the flood.
D.
The cause of the flood.
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