Special tools are required for lapping or grinding
It is impossible to throttle flow with a butterfly valve
To close the valve, it is only necessary to turn the handle a quarter of a turn
The butterfly valve should never be used in a freshwater system
第1题：
The valve on the discharge side of a cargo pump on a tank vessel will usually be a ______.
A.butterfly valve
B.spectacle valve
C.check valve
D.globe valve
第2题：
Which of the following statements concerning intellectual property is wrong？（）
第3题：
The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?
A.The profile of the valve is like a globe
B.The valve seat is set into the bulbous body
C.The plug or disc of the valve is made vertical to the axis of the pipe
D.The valve seat is located at right side of the plug or disc
第4题：
Protects against suction valve float
Provides a positive pressure on the air inlet valves
Prevents lubricating oil contamination of the compressed air supply
Protects against the damaging effects of airborne solid particles
第5题：
Energy can be created or destroyed
Energy may not be transformed
The total quantity of energy in the universe is always the same
None of the above
第6题：
What is an advantage of a gate valve over a butterfly valve ________．
A.Less frequent maintenance
B.Faster operation
C.Cheaper
D.More compact
第7题：
Which of the following statements is TRUE concerning the po column of the vmstat command？（）
第8题：
A language change is inevitable
B language change is abrupt
C language change is universal
D language change is extensive
第9题：
c=d
l and k are parallel
m and l are perpendicular
第10题：
Cargoes are any type of goods transported by any type of ships
Cargoes are goods transported in bulk
Cargoes usually include goods transported in bulk and in containers
Cargoes are usually packaged in containers