单项选择题

舌下给药的特点有（）

A.吸收快
B．可避免胃酸破坏
C．吸收后首先随血流进入肝脏
D．可避免首过效应

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Simulation and experimental studies _____, which show that the axial ratio bandwidth of the antenna is directly proportional to the thickness of the substrate.

A、have been performed
B、is performed
C、was performed
D、were performed

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语句Option Base 1:Dim a(3,4)定义的数组所包含的数组元素的个数是________。

A、7
B、12
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