PBCH支持的调制方式是() ["BpsK,","QPSK,","16QAM,","32QAM."]
飞行区内草高一般不应超过()厘米,并且不得遮挡助航灯光和标记牌。 ["15","20","25","30"]
用洗油吸收煤气中的苯时,为什么说油温度保持比煤气温度略高几度?
PBCH的发送周期为()ms。 ["10,","20,","30,","40."]
OI表示什么意思?() ["过载指示,","质差,","弱覆盖,","电量不足."]
与正面垂直的直线,与其它两个投影面一定(),这样的直线称为()。