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问题 填空题

六年三班有40名同学，每人都向希望工程捐了款．其中有一名同学捐了2.80元．但是统计数字时把这个数字搞错了，结果计算出的全班平均每人捐款数比实际平均每人捐款数高了0.63元．统计数字时把这个数字当成了______元．

答案

0.63×40+2.80，

=25.2+2.80，

=28（元）；

答：统计时把这个数字当成了28元．

故答案为：28．

单项选择题

我国可观赏“白夜”的地区是（）。

A.黑龙江漠河

B.新疆天山

C.内蒙古大兴安岭

D.吉林长白山
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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.

（20）是（）

A.acting

B.working

C.malfunctioning

D.functioning
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