《工程建设项目招标范围和规模标准规定》要求设计服务的采购单项合同估算价在( )万元人民币以上时,必须进行招标。
A.200 B.100 C.50 D.20
参考答案:C
My father is a little lazy. He _____ very hard.[ ]
A. don't work
B. don't works
C. doesn't work
D. doesn't works
金属格构式跨越架的拉线位置应根据现场地形情况和架体组立高度确定。跨越架的各个立柱应有独立的拉线系统,立柱的长细比一般不应大于()。
A.80
B.100
C.120
D.140