搜题请搜索小程序“爱下问搜题”
问题 单项选择题 B型题

1946年通过的第一个关于人体实验的国际文件（）。

A.《希波克拉底誓言》

B.《赫尔辛基宣言》

C.《夏威夷宣言》

D.《纽伦堡法典》

E.《人体构造》

答案

参考答案：D

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) flame bearing positive or negative (73) 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 flame 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.

（74）处应填（）。

A．vanish

B．vary

C．appear

D．incline
查看答案
问答题 简答题

与一般目的的建筑火灾风险评估相比，特定目的的评估有哪些不同？
查看答案