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问题 多项选择题

通过直接或间接的资料分析，对地区经济发展进行预测，从而发现它对专业不动产及市场的影响，例如通过( )等资料，推算对专业不动产的需求增量。

A．人口

B．就业

C．收入

D．区域状况

E．住房

答案

参考答案：A,B,C

单项选择题

The usual way to ensure reliable delivery is to provide the （71） with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special （72） frame bearing positive or negative （73） about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the the frame has arrived safely. On the other hand, a negative acknowledgement means that something has gone wrong, and the frame must be transmitted again.An additional complication comes from the possibility that hardware troubles may cause a frame to （74） completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame and then waits for an acknowledgement, positive or negative, will hang forever if a frame is ever lost due to, for example, （75） hardware.。

A．data

B．controll

C．request

D．session
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问答题 简答题

计算题：将30×1.4的管材拉制成9.52×0.7mm，延伸系数是多少？
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