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问题 单项选择题

结核性冷脓肿的脓液为

A．黄色黏稠脓液
B．淡黄稀薄脓液
C．翠绿色、稍黏稠、有酸臭味的脓液
D．灰白色或灰褐色、有明显腐败坏死臭味的脓液
E．稀薄污浊、暗灰色米汤样、夹杂干酪样坏死物的脓液

答案

参考答案：E

单项选择题

下列各项中，不属于股票回购方式的是( )。

A．用本公司普通股股票换回优先股

B．与少数大股东协商购买本公司普通股股票

C．在市场上直接购买本公司普通股股票

D．向股东标购本公司普通股股票
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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) hardwareo

A．receiver

B．controller

C．sender

D．customer
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