为避免哌唑嗪"首剂现象"，可采取的措施为（）
A.空腹服用
B.低钠饮食
C.小剂量睡前服用
D.舌下含用
E.首剂加倍
参考答案：C
A．He has ever visited no more than two cities.
B．He has made only a few business trips.
C．He has never been to Shenzhen and Beijing.
D．He has been to many small cities.
下列结论中正确的是（ ）
A．命题p是真命题时，命题“P且q”定是真命题
B．命题“P且q”是真命题时，命题P一定是真命题
C．命题“P且q”是假命题时，命题P一定是假命题
D．命题P是假命题时，命题“P且q”不一定是假命题
