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【单选题】
在采用离子效应火警探测传感器中,是否发报警信号取决于______。A.
镅241能发射的α射线的强度
B.
空气温差
C.
内外电离室压差
D.
空气中的含烟浓度
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【简答题】课文语法选择。 I was not feeling very well so the doctor checked my heart and said I needed more exercise.I have never been very 1 , and I do not like sports.I have always wanted a pet, 2 my parents gave ...
【单选题】C级分隔是指________。I.用认可的不燃材料制成;II.经标准耐火试验后能防止烟及火焰通过;III.限制背火面的温升;IV.允许使用厚度不超过2.5mm的可燃装饰板。
A.
Ⅰ，Ⅳ
B.
Ⅱ，Ⅳ
C.
Ⅰ，Ⅲ
D.
Ⅰ，Ⅱ，Ⅲ
【简答题】A cruel lion lived in the forest. Every day, he killed and ate a lot of animals. The other animals were afraid the lion would kill them all. The animals told the lion, “ Let’s make a deal. If you prom...
【单选题】超链接a元素的访问前、访问后、鼠标悬停及鼠标单击时的样式,可以通过伪类设置样式,其中设置访问后样式的伪类是:
A.
active
B.
hover
C.
visited
D.
link
【单选题】Goodbye!_about you every day until you come back.
A.
I think
B.
I'll have thought
C.
I'll be thinking
D.
I thought
【简答题】10 课文语法选择。 I was not feeling very well so the doctor checked my heart and said I needed more exercise.I have never been very 1 , and I do not like sports.I have always wanted a pet, 2 my parents ga...
【简答题】课文语法选择。 I was not feeling very well so the doctor checked my heart and said I needed more exercise.I have never been very 1 , and I do not like sports.I have always wanted a pet, 2 my parents gave me ...
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