问题
单项选择题
705型试验台的操纵阀共有（）作用位。
A.5个
B.6个
C.7个
D.8个
答案
参考答案：D
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705型试验台的操纵阀共有（）作用位。
A.5个
B.6个
C.7个
D.8个
参考答案：D
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