单选题In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.AGlobe valveBButterfly valveCGate valveDPackless valve
单选题
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
A
Globe valve
B
Butterfly valve
C
Gate valve
D
Packless valve
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