单项选择题
LKJ启动周期警惕功能后开始计时，计时达到（），LKJ弹出提示窗口，并开始（）倒计时。
A.120s；20s
B.20s；120s
C.20s；10s
D.10s；20s
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单项选择题
A.120s；20s
B.20s；120s
C.20s；10s
D.10s；20s
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