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【单选题】
下面哪种方式设置密码才是安全的？（）
A.
使用连续的字母或数字
B.
保证至少3个字符以上的密码长度。
C.
避免使用重复的密码。
D.
使用固定密码
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
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B.
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【单选题】There are 4 I/O ports in 8051 MCU. In these ports, P0has No Pull-up register in it,P3has some special function pins, can be used as data bus.
A.
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