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【单选题】
沉淀池的形式按 ( )不同,可分为平流、辐流、竖流3种形式A.
池的结构
B.
池的容积
C.
水流方向
D.
水流速度
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皮皮学刷刷变学霸
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【简答题】Fires may do more damage than the earthquakes(地震).
【简答题】A．They lived in large groups. B．They used sand as insulation. C．They kept fires burning constantly. D．They faced their homes toward the sourth.
【单选题】Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed spaces, such as in a pumproom, provided that the ______.
A.
persons in the space wear gas masks
B.
persons in the space wear damp cloths over their mouths and nostrils
C.
ventilation system is secured and all persons leave the space
D.
ventilation system is kept operating
【单选题】According to the passage, a fire storm______.
A.
is often seen when large forest fires break out.
B.
often occurs after the atomic explosions
C.
produces forces that draw everything into the fire
D.
is a disaster that can destroy everything in the area
【简答题】The prive measures for forest fires include some preemptive(抢先)methods that can help reduce the risks of fires and control their severity and spread，and thus, maintain ecological balance and prot...
【单选题】—What can I do for you, sir ? —I want to buy a flat—large, comfortable and ________ at the seaside.
A.
in all
B.
after all
C.
above all
D.
first of all
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