单选题During working, thermostatic expansion valve should be （）.Aeither all the way open or all the way closedBnormally fully openCthrottled depending on loadDcontrolled by liquefied pressure
单选题
During working, thermostatic expansion valve should be （）.
A
either all the way open or all the way closed
B
normally fully open
C
throttled depending on load
D
controlled by liquefied pressure
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