在AIS设备中ClassB是_______

The woman will probably ______ on Thursday afternoon.A．go to classB．draw a posterC．attend

According to the passage, the writer _______.A．belongs to a high social classB．comes from

I won’t be able to attend the meeting tonight because _________ .A.I must teach a classB.I

下列选项中是合法的标识符的是( )。A.12classB.+voidC.-5D._black

AIS的工作频率是________ 50

AIS可以用于船与船之间的_______。①识别;②监视;③避碰;④通信;⑤定位