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【单选题】
以下关于IP分组结构的描述中,错误的是A.
IPv4分组头的长度是可变的
B.
分组头长度最小为20B，最大为60B
C.
协议字段表示IP协议版本号，值为4表示IPv4
D.
生存时间字段表示一个分组一次传输过程中可以经过的最多的跳数
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举一反三
【简答题】设备改善活动的步骤( )、( )、( )、( )、( )、( ); (7)效果确认;(8)防止再次发生;(9)总结。
【简答题】I .Translate the following sentences into Chinese. Crayons danced across sheets of paper to illustrate our dream jobs.
【单选题】Read the section "Coloring Pages Need Crayons." Which detail explains how other people can help give crayons?
A.
She knew just what to do. Give kids crayons.
B.
It costs a lot to buy new crayons for every child in the hospital.
C.
Brooklyn's project will bring joy and crayons to many kids.
D.
The family started a wish list online. Anyone can contribute to it.
【简答题】翻译3:Crayons danced across sheets of paper to illustrate our dream jobs.
【单选题】What is a reason why hospitals do NOT have enough crayons?
A.
Kids take the crayons.
B.
Hospital crayons break.
C.
Crayons are expensive.
D.
Crayons are against the rules.
【简答题】Crayons danced across sheets of paper to illustrate our dream jobs. 请翻译这个句子。
【简答题】Crayons danced across sheets of paper to illustrate our dream jobs.
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