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【单选题】
半自动闭塞区段，遇发车进路信号机故障或超长列车头部越过发车进路信号机发车时，列车越过发车进路信号机的行车凭证为( )A.
调度命令
B.
C.
绿色许可证
D.
半自动闭塞发车进路通知书（附件9）
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】阅读文章，回答下列各题： This is the second month running that your delivery has been late in arrival. Our current order for stationery is already 6 days overdue. We have a number of valued customers who are bein...
【判断题】在rdt协议中，引人定时器来处理数据包的丢失。 如果在定时器的持续时间内未接收到发送的分组的ACK，则假定分组（或其ACK或NACK）已经丢失，因此会重传数据包。
A.
正确
B.
错误
【单选题】______is not mentioned in the text as having become popular with the public after the disaster.
A.
Dating
B.
Getting married
C.
Traveling
D.
Playing chess
【单选题】听力原文：W Chandler, did you speak to the people in shipping about my delivery? I need to show a client the samples tomorrow. M Yes. They said that it will arrive tomorrow afternoon. W I'm afraid that'll ...
A.
She didn't make an arrangement for delivery.
B.
She didn't receive her package.
C.
She will be late for the meeting.
D.
She can't contact the supervisor.
【简答题】After having asked somebody a question, it'll be polite of you to __________.
【简答题】A．After having the request signed by the doctor. B．After meeting Prof. Brown. C．After talking with the Dean. D．After meeting Mr. Cheng.
【简答题】船舶被强力甲板划分为（）、和（）两部分。
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