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
查看答案
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
宗桢和翠远在封锁期间他们恋爱着了。
A. 正确
B. 错误
微信支付 
支付宝支付