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【单选题】
磺胺类药物的基本结构是A.
对氨基苯磺酰胺
B.
对羟基苯磺酸
C.
间氨基苯磺酰胺
D.
间羟基苯磺酰胺
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【单选题】Jack enjoys watching TV, while Tom is interested in listening to _____ music. [ ]
A.
the
B.
/
C.
a
D.
an
【单选题】Tom is interested in and clever at many different things,so he is ( ).
A.
vertical
B.
versatile
C.
variable
D.
vigorous
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A.
access
B.
career
C.
passion
D.
involvement
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A.
/;the
B.
/;/
C.
the;/
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the; the
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A.
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B.
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C.
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D.
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A.
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B.
被控对象单一化，通过控制系统难以设计；
C.
控制方案多，控制要求高；
D.
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