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【单选题】
下列那个官能团是紫外光谱中的发色团( )
A.
-C=O
B.
-OH
C.
-Cl
D.
-SH
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参考答案:
举一反三
【单选题】十进制54转换为2进制/8进制/16进制及8421BCD码
A.
二进制110110 ,八进制 66  ,十六进制 36 ,8421BCD码01010100
B.
二进制01010100,八进制 65  ,十六进制 37 ,8421BCD码01010101
C.
二进制110111 ,八进制 64  ,十六进制 F5 ,8421BCD码110110
D.
二进制111110 ,八进制 63  ,十六进制 3E ,8421BCD码111110
【单选题】Highly motivated, ambitious people often __________ more hours in a day. A. needing B. need C. needed D. are needing
A.
needing
B.
need
C.
needed
D.
are needing
【简答题】needing sth. to eat
【单选题】神经-肌肉接头兴奋的传递是( )。
A.
多向性
B.
单向性
C.
可逆性
D.
双向性
【单选题】神经肌肉接头兴奋传递的特点错误的是()
A.
接头前膜释放的递质是ACh
B.
递质释放为量子式释放
C.
接头后膜的受体是N1受体
D.
单向传递
【简答题】adj. needing a lot of skill, patience, effort, etc; expecting a lot of work or attention from others; not easily satisfied
【单选题】─I want to teach in this area. ─Well, teachers ______ very much here. [     ]
A.
need
B.
are needing
C.
are needed
D.
will need
【单选题】The sheets for your bed                washing.
A.
needs
B.
are needing
C.
want
D.
are wanting
【简答题】adj. needing or wanting sth so much. de______
【简答题】What three ways were introduced as celebrations of the New Year in the USA?
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