Multistage compressors are used in industry, because they

1.	Multistage compressors are used in industry, because they
A.	reduce the cost of compressor.
B.	reduce the size requirement,
C.	resemble closely to isothermal compression.
D.	are easy to control.
Answer» D. are easy to control.

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Multistage compressors are used in industry, because they

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