皮皮学，免费搜题
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搜题
【简答题】
A. 物理层不负责传输差错检测和纠错任务 %40font-face%20%7B%0A%20%C2%A0font-family%3A%20%E5%AE%8B%E4%BD%93%3B%0A%7D%40font-face%20%7B%0A%20%C2%A0font-family%3A%20%E5%AE%8B%E4%BD%93%3B%0A%7D%40font-face%20%7B%0A%20%C2%A0font-family%3A%20%26quot%3B%40%E5%AE%8B%E4%BD%93%26quot%3B%3B%0A%7Dp.MsoNormal%2C%20li.MsoNormal%2C%20div.MsoNormal%20%7B%20margin%3A%200cm%200cm%200.0001pt%3B%20text-align%3A%20justify%3B%20font-size%3A%2010.5pt%3B%20font-family%3A%20%26quot%3BTimes%20New%20Roman%26quot%3B%2C%20%26quot%3Bserif%26quot%3B%3B%20%7D.MsoChpDefault%20%7B%20font-size%3A%2010pt%3B%20%7Ddiv.WordSection1%20%7B%20%7D B. 物理层规定了具体的传输媒体 %40font-face%20%7B%0A%20%C2%A0font-family%3A%20%E5%AE%8B%E4%BD%93%3B%0A%7D%40font-face%20%7B%0A%20%C2%A0font-family%3A%20%E5%AE%8B%E4%BD%93%3B%0A%7D%40font-face%20%7B%0A%20%C2%A0font-family%3A%20%26quot%3B%40%E5%AE%8B%E4%BD%93%26quot%3B%3B%0A%7Dp.MsoNormal%2C%20li.MsoNormal%2C%20div.MsoNormal%20%7B%20margin%3A%200cm%200cm%200.0001pt%3B%20text-align%3A%20justify%3B%20font-size%3A%2010.5pt%3B%20font-family%3A%20%26quot%3BTimes%20New%20Roman%26quot%3B%2C%20%26quot%3Bserif%26quot%3B%3B%20%7D.MsoChpDefault%20%7B%20font-size%3A%2010pt%3B%20%7Ddiv.WordSection1%20%7B%20%7D C. 物理层提供流量控制 %40font-face%20%7B%0A%20%C2%A0font-family%3A%20%E5%AE%8B%E4%BD%93%3B%0A%7D%40font-face%20%7B%0A%20%C2%A0font-family%3A%20%E5%AE%8B%E4%BD%93%3B%0A%7D%40font-face%20%7B%0A%20%C2%A0font-family%3A%20%26quot%3B%40%E5%AE%8B%E4%BD%93%26quot%3B%3B%0A%7Dp.MsoNormal%2C%20li.MsoNormal%2C%20div.MsoNormal%20%7B%20margin%3A%200cm%200cm%200.0001pt%3B%20text-align%3A%20justify%3B%20font-size%3A%2010.5pt%3B%20font-family%3A%20%26quot%3BTimes%20New%20Roman%26quot%3B%2C%20%26quot%3Bserif%26quot%3B%3B%20%7D.MsoChpDefault%20%7B%20font-size%3A%2010pt%3B%20%7Ddiv.WordSection1%20%7B%20%7D D. 物理层实现实体层之间的按位传输 %40font-face%20%7B%0A%20%C2%A0font-family%3A%20%E5%AE%8B%E4%BD%93%3B%0A%7D%40font-face%20%7B%0A%20%C2%A0font-family%3A%20%E5%AE%8B%E4%BD%93%3B%0A%7D%40font-face%20%7B%0A%20%C2%A0font-family%3A%20%26quot%3B%40%E5%AE%8B%E4%BD%93%26quot%3B%3B%0A%7Dp.MsoNormal%2C%20li.MsoNormal%2C%20div.MsoNormal%20%7B%20margin%3A%200cm%200cm%200.0001pt%3B%20text-align%3A%20justify%3B%20font-size%3A%2010.5pt%3B%20font-family%3A%20%26quot%3BTimes%20New%20Roman%26quot%3B%2C%20%26quot%3Bserif%26quot%3B%3B%20%7D.MsoChpDefault%20%7B%20font-size%3A%2010pt%3B%20%7Ddiv.WordSection1%20%7B%20%7D
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I'm sure he hasn't sent the letter. If he ______ it, I ______ .
A.
sent, got
B.
sent, have got
C.
sent, would go
D.
had sent, would have got
【单选题】Wre sent a telegram yesterday as we______any letter from him for a long time.
A.
haven't received
B.
didn't receive
C.
hadn't received
D.
would not receive
【单选题】What did Goodyear do as the first step to fight against absenteeism?
A.
They sent a letter to each employee's home through the post office.
B.
They sent letters to employees' homes in person.
C.
They gave away prizes first.
D.
They punished its employees severely.
【简答题】He sent me _____ letter, but _____ letter didn't arrive.
【单选题】I' m sure the letter won' t arrive in time ______ it is sent by air.
A.
if
B.
until
C.
because
D.
unless
【简答题】在上一次实验的基础上,修改代码,给3个按钮添加事件。 单击“登录”按钮时,弹出登录窗口; 单击“注册”按钮时,弹出注册窗口; 单击“取消”按钮时,关闭窗口,结束程序。
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