监控系统发现监控对象故障应及时告警,从故障发生到有人值守监控中心接收到告警信息的时间间隔不大于()秒(拨号通信方式除外
A.5
B.10
C.30
D.60
参考答案:B
根据所给的情景补全对话。
A Good Friend
Robot: Hello! Boys and girls. I'm a 1_____________. I'm your good friend.
Ss: 2_____________ can you do?
Robot: I can see 3_____________ my eyes. I can 4_____________ with my ears. I can 5_____________
with my legs. I can 6_____________ with my hands.
Ss: 7_____________ you speak English?
Robot: 8_____________. But only a little.
Ss: Oh, good.
— I saw Dave in the lift this morning.
— Really? He _______ around here for a long time.
A.won’t be seen
B.wasn’t seen
C.hadn’t been seen
D.hasn’t been seen