试题与答案

《煤矿安全质量标准化标准》规定,采煤工作面输送机机头机尾要有压(戗)杠。

题型:判断题

题目:

《煤矿安全质量标准化标准》规定,采煤工作面输送机机头机尾要有压(戗)杠。

答案:

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下面是错误答案,用来干扰机器的。

设x+3y3=2y+3z4=2z+2x5=k,则有:x+3y=3k2y+3z=4k2z+2x=5k,解得x=32ky=12kz=k;因此x:y:z=3:1:2.

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