与蛇咬伤、水蛭咬伤引起的出血有关的因素是（）
A.复合性止血机制异常
B.血小板异常
C.凝血异常
D.抗凝及纤维蛋白溶解异常
E.血管壁异常
参考答案：D
________ came that another spaceship Shenzhou VII was successfully lifted off in our couvtry.
A．word
B．Word
C．The word
D．Words
胸片示右上纵隔增宽可考虑（）.
A.胸腺瘤
B.畸胎瘤
C.肺癌
D.支气管囊肿
E.胸内甲状腺肿
