题目:
建筑工程施工安全技术 |
使用竹竿搭设脚手架时,其立杆、斜杆、顶撑、大横杆的小头及小横杆的小头一般均不小于( )。
A.60mm、75mm
B.75mm、90mm
C.60mm、90mm
D.75mm、85mm
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C解析:Economic rent is the difference between the price paid for a resource and its opportunity cost in its next-highest-valued employment. To earn economic rent,...