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【单选题】
When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent _____.
A.
air from contacting the oil vapors
B.
permitting re-ignition boiling of the heated oil
C.
spontaneous combustion below the oil surface
D.
toxic fumes from escaping to the surface
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参考答案：
举一反三
【判断题】装配图中,并不是所有种类零件、部件都要编写序号,该说法是否正确
A.
正确
B.
错误
查看完整题目与答案
【单选题】在两级放大电路中，已知各自单级20lg|AVM1| = 40dB，fL1 = 4Hz，fH1 = 20kHz；20lg|AVM2| = 30dB，fL2 = 400Hz，fH2 = 150kHz。则两级放大电路的电压增益为 ，上限截止频率约为 ，下限截止频率约为 。
A.
70dB ， 20kHz ， 400Hz
B.
10dB ， 20kHz ， 150Hz
C.
12dB ，， 44kHz ， 400Hz
D.
40dB ， 170kHz ， 4Hz
查看完整题目与答案
【单选题】在两级放大电路中,已知各自单级20lg|AVM1| = 40dB,fL1 = 4Hz,fH1 = 20kHz;20lg|AVM2| = 30dB,fL2 = 400Hz,fH2 = 150kHz。则两级放大电路的电压增益为 ,上限截止频率约为 ,下限截止频率约为 。
A.
40dB,170kHz ,4Hz
B.
70dB,20kHz,400Hz
C.
12dB,,44kHz,400Hz
D.
10dB,20kHz,150Hz
查看完整题目与答案
【单选题】建构拉伸特征时出现失败的原因主要有( )
A.
截面不封闭
B.
没有中心线
C.
截面完全封闭
D.
尺寸标注不完整
查看完整题目与答案
【单选题】保尔柯察金是哪本书中的人物?
A.
钢铁是怎样炼成的
B.
百万英镑
C.
资治通鉴
D.
阿甘正传
查看完整题目与答案
【简答题】multiple modems
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【单选题】According to the passage, the difference between DSL and cable modems is _____________.
A.
DSL is faster than cable modems
B.
DSL is more vulnerable to viruses
C.
you have to connect if you want to surf the Internet using DSL, while you don’t if you use cable modems.
D.
DSL is superior to cable modems
查看完整题目与答案
【简答题】A．cables B．hosts C．servers D．modems
查看完整题目与答案
【判断题】Modems can be classified external ones and internal ones.
A.
正确
B.
错误
查看完整题目与答案
【单选题】In which of the following exchanges is there a grammatic mistake?
A.
---Have they removed their furniture? ---They have done the desks, but that's all so far.
B.
---Does granny look after you every day? ---She can't do at weekends, because she has to go to her own house.
C.
---Can lions climb trees? ---No, but leopards can.
D.
---Did the lions seem hungry? ---No, but they did restless.
查看完整题目与答案
相关题目：
【判断题】装配图中,并不是所有种类零件、部件都要编写序号,该说法是否正确
A.
正确
B.
错误
查看完整题目与答案
【单选题】在两级放大电路中，已知各自单级20lg|AVM1| = 40dB，fL1 = 4Hz，fH1 = 20kHz；20lg|AVM2| = 30dB，fL2 = 400Hz，fH2 = 150kHz。则两级放大电路的电压增益为 ，上限截止频率约为 ，下限截止频率约为 。
A.
70dB ， 20kHz ， 400Hz
B.
10dB ， 20kHz ， 150Hz
C.
12dB ，， 44kHz ， 400Hz
D.
40dB ， 170kHz ， 4Hz
查看完整题目与答案
【单选题】在两级放大电路中,已知各自单级20lg|AVM1| = 40dB,fL1 = 4Hz,fH1 = 20kHz;20lg|AVM2| = 30dB,fL2 = 400Hz,fH2 = 150kHz。则两级放大电路的电压增益为 ,上限截止频率约为 ,下限截止频率约为 。
A.
40dB,170kHz ,4Hz
B.
70dB,20kHz,400Hz
C.
12dB,,44kHz,400Hz
D.
10dB,20kHz,150Hz
查看完整题目与答案
【单选题】建构拉伸特征时出现失败的原因主要有( )
A.
截面不封闭
B.
没有中心线
C.
截面完全封闭
D.
尺寸标注不完整
查看完整题目与答案
【单选题】保尔柯察金是哪本书中的人物?
A.
钢铁是怎样炼成的
B.
百万英镑
C.
资治通鉴
D.
阿甘正传
查看完整题目与答案
【简答题】multiple modems
查看完整题目与答案
【单选题】According to the passage, the difference between DSL and cable modems is _____________.
A.
DSL is faster than cable modems
B.
DSL is more vulnerable to viruses
C.
you have to connect if you want to surf the Internet using DSL, while you don’t if you use cable modems.
D.
DSL is superior to cable modems
查看完整题目与答案
【简答题】A．cables B．hosts C．servers D．modems
查看完整题目与答案
【判断题】Modems can be classified external ones and internal ones.
A.
正确
B.
错误
查看完整题目与答案
【单选题】In which of the following exchanges is there a grammatic mistake?
A.
---Have they removed their furniture? ---They have done the desks, but that's all so far.
B.
---Does granny look after you every day? ---She can't do at weekends, because she has to go to her own house.
C.
---Can lions climb trees? ---No, but leopards can.
D.
---Did the lions seem hungry? ---No, but they did restless.
查看完整题目与答案
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