角位移传感器是通过内部的倾角传感器测量抽油机的冲程、冲次及油井周期，在RTU控制定时下可以独立测量油井的示功图。（）
参考答案：错
28 He spoke very slowly, but he still didn’t get his meaning _______.
A across B cross C through D though
当识别信号的音频调制频率为1020Hz时，其允许的误差为±100Hz。
