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搜题
【单选题】
600多年前,我国明朝一个名叫的航海家,带领船队,先后七次经过我国的南海,到达印度洋沿岸国家,和沿岸的国家做丝绸、陶瓷等产品的生意,开辟了一条什么A.
海上丝绸之路
B.
丝绸之路
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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】In which stage of PPP approach will students have the chance to use the language freely and incorporated it into their existing language?
A.
presentation stage
B.
production stage
C.
practice stage
D.
pre-task stage
【多选题】下面哪些是组合逻辑电路的特点( )。
A.
组合逻辑电路在任一时刻的输出状态仅由该时刻的输入状态决定，而与过去的输入状态无关；
B.
组合逻辑电路不存在反馈路径；
C.
组合逻辑电路无记忆功能；
D.
组合逻辑电路无记忆功能。
【单选题】In which stage of the Presentation-Practice-Production approach will students have the chance to use the new language freely and incorporate it into their existing language?
A.
Presentation stage
B.
Practice stage
C.
Production stage
D.
Practice stage and production stage
【单选题】Why will a switch never learn a broadcast address?（）
A.
Broadcast frames are never sent to swiches.
B.
Broadcast addresses use an incorrect format for the switching table.
C.
A broadcast address will never be the source address of a frame.
D.
Broadcasts only use network layer addressing.
E.
A broadcast frame is never forwarded by a switch.
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