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【单选题】
叶酸的拮抗剂是()
A.
次黄嘌岭
B.
胸腺嘧啶核苷
C.
HGPRT
D.
甲氨蝶呤
E.
叶酸
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参考答案:
举一反三
【单选题】While having lunch with a friend recently, we got into a _____ that is pretty frequent in China about morning greeting.
A.
conversation
B.
conservation
C.
reservation
D.
criterion
【单选题】In order to ________ the disease, the first thing we should do is to do research about it and find out a satisfactory cure.
A.
confirm
B.
conduct
C.
control
D.
confuse
【简答题】Who is the fax sent to? It is sent to
【单选题】We should do more such exercises in the future,I think,_____ those we did yesterday.
A.
as
B.
like
C.
about
D.
than
【判断题】Silence refers the study of nonverbal communication sent by the eyes.
A.
正确
B.
错误
【单选题】We must put _____ into practice.
A.
that we have learned
B.
what we have learned
C.
that have we learned
【简答题】细胞和组织的酸性物质或结构与硷性染料亲合力强者,称();而硷性物质或结构与酸性染料亲合力强者,称();若与两种染料的亲合力均不强者,称()。
【单选题】下列物质,具有“两亲性”的是( )
A.
肥皂
B.
-COOH
C.
奶油
D.
癸烷
E.
-SO 2 OH
【判断题】表面活性物质分子结构具有两亲结构
A.
正确
B.
错误
【判断题】表面活性剂具有“两亲性”,但并非所有具“两亲性”的物质都可作表面活性剂来使用。
A.
正确
B.
错误
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