What __________ Li Ming have now?[ ]
A. is
B. does
C. did
D. about
答案:B
f (x)定义在(0,+∞)上的非负可导函数,且满足xf′(x)+f(x)≤0,对任意的正数a,b,若a<b,则必有( )
A.af(b)≤bf(a)
B.bf(a)≤af (b)
C.af(a)≤bf (b)
D.bf(b)≤af (a)
患者始恶寒发热,咳嗽,咳白色粘痰,痰量逐渐增多,胸痛,咳则尤甚,呼吸不利,口干鼻燥,苔薄黄,脉浮数。应诊断为()
A.风热咳嗽
B.燥热咳嗽
C.初期肺痈
D.风热感冒
E.成痈期肺痈