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【单选题】
驻车制动阀为手动（），拉动手柄，驻车制动阀换向，使安全钳油缸卸压，碟簧弹力使安全钳实现驻车制动。
A.
单向阀
B.
换向阀
C.
比例减压阀
D.
溢流阀
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】After the birth of my second child，I got a job at a restaurant.Having worked with an experienced 16for a few days，I was 17to wait tables on my own.All went 18that first week.When Saturday night came，I...
A.
repeated
B.
discovered
C.
corrected
D.
described