对于溜板行程为500~1000mm的车床,在溜板1m行程和全部行程上的直线度允差值均为(),误差曲线只许凸起。
A. 0.01
B. 0.02
C. 0.03
D. 0.04
根据《工程建设强制条文》要求,水域勘察时,()级大风时,严禁勘察作业,()级大风或接到台风预警信号时,应立即撤船回港
A. 6;7
B. 6;6
C. 5;5
D. 5;6
The static suction head of is the ()
A. distance of the suction liquid level above the line of the pump
B. distance the suction liquid level is below the center line of the pump
C. force necessary to overcome frictional losses in the pump and piping
D. amount in inches of mercury the total suction head is below atmospheric pressure