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【单选题】
夏季,南方某绵羊场,卫生条件差,吸血昆虫滋生,近日内绵羊陆续发病,体温升高,厌食,流涎,口唇发绀,口腔黏膜糜烂溃疡,鼻腔流出分泌物,部分羊肢行。与病羊接触后牛群一般表现为(2017 真题上196)A.
采食困难
B.
呼吸困难
C.
神经症状
D.
呕吐腹泻
E.
隐性感染
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举一反三
【单选题】Networks use microwave radio to link the computers when ______.
A.
they are close together
B.
they are far away from each other
C.
coaxial cables are used
D.
fiber optical is used
【简答题】Task 3 Complete the following sentence with the words or phrases given below. Change the form if necessary. 1. I think that salesman is very rude and foolish as he asks us to accept what he offers ___...
【简答题】比例尺精度是如何定义的?有何作用?
【单选题】A ( ) protocol is used to move a datagram over an individual link.
A.
application-layer
B.
transport-layer
C.
network-layer
D.
link-layer
【简答题】With a link over the Channel, you could buy your fish and chips in England and be able to eat them in France while they were still warm ! ( Passage 3 )
【简答题】I think that salesman is very rude and foolish as he asks us to accept what he offers _____________. 2. OK! I’ll send you our latest catalog and _____________ in two days. 3. _____________ used to mea...
【简答题】Paper money ______ (use)for over a thousand years．
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