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【单选题】
在确定了零点标高的基础上,一个低于零点标高3米的建筑,其标高数字标注为
A.
+3.000
B.
±3.000
C.
3.000
D.
-3.000
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【判断题】在消防系统中,火灾信息可由火灾探测器的电信号、报警信号或者人工确认信号获得。
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