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【单选题】
23-1. 使用mail命令的信箱通信属于( A ),信息是被发送到接收方的信箱中;使用write命令,实现的是实时通信,信息是被送到收方的屏幕;使用共享文件进行通信的方式属于管道通信。A.
（1）其享存储器
B.
（2）实时通信
C.
（3）消息缓冲通信
D.
（4）非实时通信
E.
（5）管道通信
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【单选题】国务院和县级以上地方各级人民政府应当建立健全()，及时协调、解决安全生产监督管理中存在的重大问题。
A.
安全生产情况通报机制
B.
安全生产工作协调机制
C.
安全生产联席会议机制
【单选题】Crusoe ___ a boat, but he failed.
A.
meant to build
B.
meant building
C.
had meant to build
D.
had meant building
【简答题】A．It meant he disliked the thought of having a snake in the house. B．It meant he was afraid David would put the snake in his bedroom. C．It meant he was afraid that the snake would hurt David. D．It mea...
【单选题】I ______, but I was prevent by the heavy rain.
A.
had meant coming
B.
had meant to come
C.
meant to come
D.
meant coming
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