下列哪种剂型可能产生首关效应
A．胶囊剂
B．注射剂
C．舌下片
D．栓剂
E．气雾剂
参考答案：B
—Could you help me with the math problem?
—________ Your must be barking up the wrong tree.
A．A pleasure.
B．Hang on a minute.
C．What’s the point?
D．Are you kidding?
动植物检疫审批手续应当在贸易合同签订后办理。( )
