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
短筒取心工具下钻时,内筒要用二档二道.外筒用二档四道猫头绳拉紧。
A. 正确
B. 错误
压力变送器采用压力传感器和大规模集成电路,将压力信号转换成()。
A. 电力信号
B. 数字信号
C. 控制信号
D. 逻辑信号
YJ29滤嘴接装机错位鼓轮有两个或三个轮环,每个轮环都有相同数量的槽。
A. 正确
B. 错误