项目法人应根据工程建设需要,委托有相应资质的质量检测单位对()()进行质量检测。
参考答案:主要材料;涉及工程主体结构安全的关键部位
It took a great deal of courage to admit that all their efforts had been ________.
A.in danger
B.in vain
C.in return
D.in turn
如果IP地址为202.130.191.33,屏蔽码为255.255.255.0,那么网络地址是什么
A.202.130.0.0
B.202.0.0.0
C.202.130.191.33
D.202.130.191.0