制造弹簧管的材料因被测介质的性质和被测压力的高低而不同。在一般情况下,被测压力p<()时,采用磷青铜。
A.10MPa
B.15MPa
C.20MPa
D.30MPa
参考答案:B
It is known to us that doing exercise _____ our health,and that is to say, ou health can ____ doing
exercise. [ ]
A. benefits; benefit from
B. benefits to; benefit
C. benefits from; benefit
D. benefits; be benefited from
进行NodeB勘察时,对环境的勘察主要有()
A.机房环境检查
B.室外安装环境检查
C.安全检查
D.电源和接地,防雷系统检查
E.传输检查和机房布局检查
F.电磁辐射防护检查