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举一反三
【单选题】There are two methods of fighting, the one by law, the other by force the first method is that of men, the second of beasts but as the first method is often insufficient, one must have recourse to the...
A.
method
B.
resort
C.
follow
D.
change
【单选题】药物在生物膜一侧形成离子障时，说明 ：
A.
离子型药物易跨膜，不易留在膜一侧
B.
非离子型药物易跨膜，离子型药物不易跨膜
C.
离子型和非离子型药物都易跨膜
D.
离子型和非离子型药物都不易跨膜
E.
非离子型药物不易跨膜，易留在膜一侧