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【单选题】
以下哪一项是 TCP 实施拥塞控制的前提条件A.
重传 TCP 报文的主要原因是因为错序被接收端丢弃该 TCP 报文
B.
重传 TCP 报文的主要原因是因为物理链路传输出错被中间分组交换设备丢弃该 TCP 报文
C.
重传 TCP 报文的主要原因是因为发生拥塞丢弃该 TCP 报文
D.
重传 TCP 报文的主要原因是因为端到端传输出错被接收端丢弃该 TCP 报文
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举一反三
【单选题】Beethoven, the great musician, wrote nine symphonies in his life, most of them ______ after he had lost his hearing.
A.
written
B.
were written
C.
had been written
D.
having written
【单选题】Is this the house ________ the great musician was born in?
A.
which
B.
where
C.
the one
D.
it
【单选题】This is the house ____ the great musician was born.
A.
which
B.
in which
C.
in where
D.
at which
【简答题】除两端的葡萄糖基外,每个葡萄糖基具有三个游离的羟基,分别位于 C 2 、 和 位置上,它们的反应活性不同,一般情况下反应活性最强的是 ;然而对于醚化反应来说,取决于羟基的离子化程度,因此反应活性最强的是 。
【单选题】Which of the following person can be a great musician?
A.
A person who has a dream to be a great musician but has no perseverance.
B.
A person who has the talent and the desire to work and improve.
C.
A person who is talented and thinks great ability can make him succeed in music.
D.
A person who has less ability and a proud attitude.
【简答题】装饰图案的分类:从图案的形态类型上可分为( )和抽象形态图案。
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