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【单选题】
以下关于IPv4分组结构特征的描述中，错误的是A.
分组头的基本长度是20字节
B.
IPv4分组由两个部分组成：分组头和数据
C.
分组头长度以4字节为单位来表示
D.
分组头选项最大长度为60字节
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举一反三
【单选题】—Li An can always ________ some special ways to make his movies win prizes in the world. —Yea. He is an unusual and creative director.
A.
look up
B.
turn up
C.
come up with
D.
give up
【判断题】After 3 photography trips, the speaker realized why his trips were unfruitful.
A.
正确
B.
错误
【简答题】There was an increase in both employment agency and online recruitment on the previous year although recruitment through newspaper adverts fell sharply.
【简答题】动力电池拆装步骤
【简答题】The number of the unemployed in this country is exactly the same before and after this year.
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