Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）<br>A:Spring-centered valve<br>B:Unloading valve<br>C:Three-position valve<br>D:Two-position valve

Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）
A:Spring-centered valve
B:Unloading valve
C:Three-position valve
D:Two-position valve

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