单选题所有梯道、走廊和起居处所内脱险通道要求的感烟探测器应在烟密度超过（）每米减光率之前动作。但在烟密度超过（）每米减光率之前不应动作。A10.5％；2％B11.5％；2％C12.5％；2％D13.5％；3％
单选题
所有梯道、走廊和起居处所内脱险通道要求的感烟探测器应在烟密度超过（）每米减光率之前动作。但在烟密度超过（）每米减光率之前不应动作。
A
10.5％；2％
B
11.5％；2％
C
12.5％；2％
D
13.5％；3％
参考解析
解析：
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