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当前学科:泵送机械理论考试(高级)
题目:
单选
80C带恒压泵系统的拖泵,其DT2、DT3是三位四通电磁换向阀,请问其中位机能是:()。
A . A、O型
B . B、H型
C . C、M型
D . D、Y型
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