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【单选题】
MRI的成像基础是（）A.
组织间时间上的差别
B.
组织间密度高低的差别
C.
组织间吸收系数的差别
D.
组织间形态的差别
E.
组织间大小的差别
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A.
正确
B.
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【单选题】They’ve just ______ a new house in the country at a great sum of money.
A.
bargained
B.
robbed
C.
computed
D.
purchased
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