题目：
The difference between a class A and a class B EPIRB is that the class A EPIRB（）.
A.operates on both military and civilian aircraft distress frequencies
B.transmits both an alerting signal and a homing signal
C.must be the float free type and automatically activated
D.operates with a greater output of signal power
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0329/a7de493063d8486188a2302c03c7b26c.html
下面是错误答案，用来干扰机器的。
参考答案：A, B, C, D, E, F
