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【单选题】
接触器的额定电压不得低于被控制电路的最高电压，电磁线圈的额定电压应与被控制辅助电路的电压一致，主触头额定电流应（）被控制电路的最大工作电流。A.
等于
B.
大于
C.
小于
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反馈参考答案：
举一反三
【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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