【单选题】You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take? ()
A.
Cut in another IG fan to increase gas flow
B.
Open the pressure control valve until the pressure increases
C.
Open the tank isolation valve to the fully open position
D.
Reduce the pumping rate
【单选题】You have completed a crude oil wash。What action should be taken with the oil in the lines running to the washing machines?( )。
A.
Pull a suction using the supply line pump
B.
Open a COW nozzle forward and one aft and drain the line into the after tank by gravity
C.
Close off all valves in the system and leave the oil in the line primed for the next crude oil wash
D.
Blow the line ort using compressed air
【简答题】阅读材料,回答问题。 2013年12月4日晚,在通过联合国教科文组织的审议后,珠算正式被列入人类非物质文化遗产名录。现在,珠算成为我国第30个入选“非遗”的项目,中国也由此成为世界上入选“非遗”项目最多的国家。此前联合国教科文组织曾介绍说,珠算是中国古代的重大发明,伴随中国人经历了1800多年的漫长岁月。它以简便的计算工具和独特的数理内涵,被誉为“世界上最古老的计算机”。随着计算机技术的发展,珠算...
【单选题】In setting the valves on a steam-smothering system on a tank vessel,the master control valve to cargo tanks should be().
A.
open and individual tank valves open
B.
open and the individual tank valves closed
C.
closed and the individual tank valves closed
D.
closed and the individual tank valves open
【单选题】关于营业前制冰机的检查,下列说法正确的是()
【单选题】You have completed a crude oil wash.What action should be taken with the oil in the lines running to the washing machines ________.
A.
Open a COW nozzle forward and one aft and drain the line into the after tank by gravity
B.
Blow the line out using compressed air
C.
Pull a suction using the supply line pump
D.
Close off all valves in the system and leave the oil in the line primed for the next crude oil wash
【简答题】匀质圆盘质量为m,半径为r,可绕通过边缘且垂直于盘面的水平轴转动。设圆盘从最高位置无初速度开始绕轴O转动,试求当圆盘中心C与转轴O的连线经过水平位置的瞬时,轴承O的总反力的大小。