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问题 单项选择题 A1/A2型题

疥疮治疗结束后经观察，如无新皮损出现，即为痊愈，停药后应观察的时间为（）

A.5～20天之内

B.1周左右

C.1个月左右

D.24小时之内

E.2周左右

答案

参考答案：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) 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.

（71）处应填（）。

A．receiver

B．controller

C．sender

D．customer
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单项选择题

“要让科技真正进村入户，就得把农民和科技人员‘绑’在一起，使农民的利益和科技人员的利益统一起来。这种‘捆绑’不是要生拉硬扯，而是要建立一种符合市场原则的激励机制。”这里的“统一”是指：（）。

A．按劳分配与按资分配的统一

B．按劳分配与按技术分配的统一

C． 按土地资源分配与按生产要素分配的统一

D． 按土地资源分配与按技术要素分配的统一
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