题目内容

交流铁心线圈，线圈电阻、匝数及电源电压不变，当铁心截面积S增加一倍，则磁感应强度B将（）。

A. 增大一倍
B. 减小一半
C. 不变

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Refer to the exhibit. Which statement is correct based on the show login command output shown？（）

A. When the router goes into quiet mode， any host is permitted to access the router via Telnet，SSH， and HTTP，since the quiet-mode access list has not been configured.
B. The login block-for command is configured to block login hosts for 93 seconds.
C. All logins from any sources are blocked for another 193 seconds.
D. Three or more login requests have failed within the last 100 seconds.

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