单选题/etc/passwd中password字段里包含了‘x’.这代表了（）意思。A加密后的口令B系统使用的是shadowpassworD.C口令是空的D口令过期了
单选题
/etc/passwd中password字段里包含了‘x’.这代表了（）意思。
A
加密后的口令
B
系统使用的是shadowpassworD.
C
口令是空的
D
口令过期了
参考解析
解析：
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