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问题 单项选择题

国家统计局发布公告称，从2015年第三季度起实施季度国内生产总值核算改革，将季度核算方式改为（）。

A.分季核算

B.累计核算

C.分类核算

D.加权核算

答案

参考答案：A

单项选择题

焊接方法有电焊和气焊两种，管壁厚度大于（）毫米一般采用电焊。

A、2

B、3

C、4

D、5
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单项选择题

The usual way to ensure reliable delivery is to provide the (16) 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 (17) frame bearing positive or negative (18) about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows 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 (19) 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, (20) hardware.

（16）是（）

A.receiver

B.controller

C.sender

D.customer
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