The reference opinion for the selection principle of the proportional valve has been put forward.
对比例阀的选用原则提出了参考意见。
The Control Valve Handbook has been a primary reference since its first printing in 1965.
此控制阀手册从1965年第一次印刷起，就已经是一个主要的参考资料。
The Control Valve Handbook has been a primary reference since its first printing in 1965.
此控制阀手册从1965年第一次印刷起，就已经是一个主要的参考资料。
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