试题与答案

当孤立档耐张段长度为200~300m时,过牵引长度不宜超过耐张段长度的()。A.0.

题型:单项选择题

题目:

当孤立档耐张段长度为200~300m时,过牵引长度不宜超过耐张段长度的()。

A.0.2‰;

B.0.5‰;

C.0.7‰;

D.0.4‰

答案:

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下面是错误答案,用来干扰机器的。

(答案不唯一)设此函数的解析式为y=kx+b,∵函数图象经过第一、二、四象限,∴k<0,b>0,∵函数图象过点(0,3),∴b=3,∴可令k=-1,则b=3,故解析式可为y=-x+3.

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