对比例阀的选用原则提出了参考意见。
The reference opinion for the selection principle of the proportional valve has been put forward.
螺杆泵选用应遵循经济、合理、可靠的原则。
Screw pump selection should follow the economy, reasonable and reliable principle.
螺杆泵选用应遵循经济、合理、可靠的原则。
Screw pump selection should follow the economy, reasonable and reliable principle.
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