基站环境告警箱能提供哪些告警功能（）
A.浸水
B.火警
C.烟雾
D.风扇告警
参考答案：A, B, C
Where was it ______ you _______ our maths teacher?
A．where; came to
B．that; come across,
C．that; came across
D．where; come to
画一个63°的角和一个87°的角．
