当代人类由电力时代迈向（），人类的经济结构、社会结构、生活环境、活动空间、工作对象、

You are a project manager for residential construction. As a project manager, you must be especially concerned with building codes particularly in the quality planning process. You must ensure that building codes are reflected in your project plans because ______ .

A) standards and regulations are an input to quality planning
B) quality audits serve to ensure there is compliance with regulations
C) they are a cost associated with quality initiatives
D) compliance with standards is the primary objective of quality control

根据《土壤环境质量标准》，土壤质量（）为保障农林业生产和植物正常生长的土壤临界值。

A.一级标准

B.二级标准

C.三级标准

D.四级标准

如果2x³yⁿ+(m-2)x是关于x、y的五次二项式，则m、n的值为[ ]

A.m=3，n=2

B .m≠2，n=2

C m为任意数，n=2

D.m≠2，n=3

缆在盘圈或盘8字形时，不得（）作业。

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