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【简答题】
试说明网桥、交换机、集线器和路由器分别工作在网络协议的哪一层?并说明三者的区别
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文： All the rescuers found in the mountains of the Sierra de Perija in Venezuela was the scattered wreckage of the plane and the charred corpses of its occupants. There were no survivors. The plane ...
A.
All the passengers were dead.
B.
Both of the plane's engines got lost.
C.
The aircraft exploded and caught fire.
D.
The black box has not been found yet.
【单选题】听力原文： All the rescuers found in the mountains of the Sierra de Perija in Venezuela was the scattered wreckage of the plane and the charred corpses of its occupants. There were no survivors. The plane ...
A.
All the passengers were dead.
B.
Both of the plane's engines' got lost.
C.
The aircraft exploded arid caught fire.
D.
The black box has not been found yet.
【判断题】The would-be rescuers didn’t succeed in saving the drowning boy because they were scared of water .
A.
正确
B.
错误
【单选题】下列关于图像文件格式的叙述,错误的是(2013)
A.
BMP 是Windows环境中的一种标准图像格式
B.
GIF 格式支持透明背景和动画，适合在网页中使用
C.
JPEG 格式是苹果公司开发的一种工业标准，适用于因特网和数码相机
D.
TIF 格式广泛应用于扫描仪和桌面印刷系统
【单选题】Rescuers were blowtorches to cut into the ( ) train compartments where more bodies might be found.
A.
dispatched
B.
stumbled
C.
charred
D.
wrecked
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