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【单选题】
与受体亲和力较强，但内在活性较弱A.
拮抗剂
B.
激动剂
C.
部分激动剂
D.
非竞争性拮抗剂
E.
竞争性拮抗剂
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举一反三
【单选题】Accidents may occur when people feed cookies and candy to bears because______.
A.
the latter is not only greedy but also unfreindly
B.
the latter may mistake a feeding hand for the offered cookie
C.
the latter is the most ferocious carnivore and they attack humans on sight
D.
.
【单选题】Which of the following statements is NOT TRUE about “The Glass Mountain”?
A.
It refuses to follow the story line of an existing fairy tale.
B.
It shows no trace of anything heroic or romantic.
C.
The author presents a picture of an absurd man doing absurd things .
D.
The story concludes with a happy ending.
【单选题】In winter, traffic accidents occur ______ on the highway.
A.
frequently
B.
suddenly
C.
usually
D.
rapidly
【单选题】Everyone wants to be healthy and happy.【C1】______, ill ness or accidents may occur without any【C2】______. Frequently the person who is【C3】______can be cared for at home if there is someone【C4】______of...
A.
Occasionally
B.
Unfortunately
C.
Miserably
D.
Naturally
【简答题】一个TCP连接的建立,需要由____次“握手”来完成。构成TCP连接的一对套接字,由IP和____组成。
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