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【单选题】
某药一次给药后的血浆药物浓度为32 mg/L。该药t1/2=1.5 h，按一级动力学消除，经9 h后血浆药物浓度应为A.
2mg/L
B.
4mg/L
C.
8mg/L
D.
0.5mg/L
E.
1mg/L
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