______ is used for providing homing signals from survival craft for detection by 9 GHz radar.
A. NAVETEX receiver
B. search and rescue transponder
C. emergency position indicating radio beacon
D. digital selective calling
查看答案
乳酸脱氢酶的I型同工酶主要存在于
A. 心肌和肝脏
B. 心肌和肾脏
C. 肝脏
D. 心肌和红细胞
E. 肾脏