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问题 选择题

造成全球海陆变迁的主要原因是（  ）

A．人类的填海造陆

B．海浪侵蚀海岸

C．地壳的变动和海平面的升降

D．全球气候变化

答案

答案：C

本题主要考查的是海陆变迁的相关知识。造成全球海陆变迁的主要原因是地壳的变动和海平面的升降。

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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多项选择题

建立专门机关与广大群众相结合的社会工程的具体内容包括( )

A．宣传组织群众，帮助群众掌握法律和政策，将群众工作纳入法制轨道

B．把群众工作贯穿于各项公安专门工作之中

C．治安工作社会化，警民结合形式多样化

D．公安科技群众化
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