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单选题
MAN-B&W-S-MC/MCE主机操纵系统气路中，集控室的操作手柄A和B都处于“STOP”位置，机控阀63、64的状态是（）。
A
阀63、64均受压上位通
B
阀63、64均不受压上位通
C
阀63受压上位通、64不受压下位通
D
阀63不受压下位通、64受压上位通
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