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目前，广泛流行的以太网所采用的拓扑结构是什么？

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无论备用电源是否有电压，只要工作电源断路器跳闸，备用电源断路器均自动投入。

A. 正确
B. 错误

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患者，男，60岁。近日咳嗽感到胸闷，呼吸不利，胸透示胸腔有积液，宜首选的药物是（）

A. 葶苈子
B. 芥子
C. 半夏
D. 旋覆花
E. 川贝母

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Refer to the exhibit. For what two reasons has the router loaded its IOS image from the location that is shown? （）

A. Router1 has specific boot system command that instruct it to load IOS from TFTP server.
B. Router1 is acting as a TFTP server for other routers.
C. Router1 cannot locate a valid IOS image in flash memory.
D. Router1 defaulted to ROMMON mode and loaded the IOS image from a TFTP server.
E. Cisco routers will first attempt to load a image from TFTP for management purposes.

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灭火器A类火灾配置场所的危险等级为轻危险级时，手提式灭火器的最大保护距离为（）m。

A. 10
B. 15
C. 20
D. 25

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