A.频率变小,波长变大
B.波长变小,频率变大
C.频率不变,波长变大
D.频率不变,波长变小
答案:C
肝素使用过量引起的出血应选用
A.氢氯噻嗪 B.头孢呋辛 C.头孢他啶 D.维生素K E.鱼精蛋白
Questions 27~30
A. It has a tutorial supervision system. B. It has progressive ideas on education. C. Its professors are more interested in research. D. Its staff maintain a good relation with the students.