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广义的遗传工程包括 和 。狭义的遗传工程是指 。
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【单选题】To fetch water before breakfast seemed to me a rule ______.
A.
to never break
B.
never to have broken
C.
never to be broken
D.
never to be breaking
【简答题】Mitsuaki recently arrived in the United States to enter the university. He wants to do well in his studies and 31 the new culture But Mitsuaki has a problem. It's not his teachers. It's not even his 3...
【单选题】Most people will find it easier to speed on a highway when everybody ______ is driving over the speed limit.
A.
too
B.
also
C.
else
D.
alone
【单选题】Excuse me for breakfast in, ______I have some news for you.
A.
so
B.
and
C.
but
D.
yet
【单选题】在下面对数据链路层的功能特性描述中,哪一个不是正确的
A.
通过交换与路由，找到数据通过网络的最有效的路径；
B.
数据链路层的主要任务是提供一种可靠的通过物理介质传输数据的方法
C.
将数据分解成帧，并按顺序传输帧，并处理接收端发回的确认帧
D.
以太网的数据链路层分为LLC和MAC子层
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