The butterfly valve is often used as a final control element in ____ or large ______ piping systems.
a. air, water
b. gas, bore
c. water, diameter
d. oil, fluid
Answer: A
The butterfly valve is often used as a final control element in ____ or large ______ piping systems.
a. air, water
b. gas, bore
c. water, diameter
d. oil, fluid