属颌面部浅静脉网的是()经内眦静脉与颅内海绵窦相通的是()静脉瓣多且完整的是()
A.面静脉
B.下颌后静脉
C.两者均有
D.两者均无
参考答案:C,A,D
Lizzie was______ to see her friend off at the airport.
A.a little more sad than
B.more than a little sad
C.sad more than a little
D.a little more than sad
地方性斑疹伤寒的主要传染源是()
A.病人
B.野鼠
C.家鼠
D.病原携带者
E.隐性感染者