![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
[主观题]
All the key words in the article are printed in ______ type so as to attract readers' atte
ntion.
A.dark
B.dense
C.black
D.bold
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.dark
B.dense
C.black
D.bold
第5题
A.缆式线性探测器
B.红外火灾探测器
C.点型火灾探测器
D.火焰探测器
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