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【单选题】
常见经典生物电子等排体是（）。A.
电子等排体
B.
生物电子等排体
C.
药物的生物电子等排原理
D.
F、Cl、OH、－NH 2 、－CH 3
E.
—CH＝、—S—、—O—、—NH—、—CH 2 —
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A.
At least three.
B.
Six.
C.
Thirteen.
D.
Fifteen.
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