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【简答题】
不等式2x﹣4＜0的是 ．
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反馈参考答案：
举一反三
【简答题】热敏电阻有负温度系数()和正温度系数(PTC)之分
【简答题】用离心油泵从贮罐向反应器输送液态异丁烷。贮罐内液面恒定,其上方绝压为6.65kgf/cm2。泵在贮罐液面下1.5m处,吸入管路的压头损失为1.6m。异丁烷在输送条件下密度为530kg/m3,饱和蒸气压为6.5kgf/cm2。已知输送流量下泵的允许汽蚀余量为3.5m。试确定该泵是否可以正常操作。
【单选题】Read the following passage and choose the best answer to fill in the blank.Unless we spend money to spot and prevent asteroids now, one might crash into Earth and destroy life as we know it, say some ...
A.
while pushing asteroids off course nuclear weapons would destroy the world
B.
asteroids racing across the night sky are likely to hit Earth in the near future
C.
The worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime
D.
Workable solutions still have to be found to prevent a collision of asteroids with Earth
【单选题】命令()可以使屏幕上X轴与Y轴的比例尺相同
A.
axis(‘manual’)
B.
axis([xminxmax])
C.
axis(‘square’)或axis(‘equal’)
D.
axisoff
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