自力式调节阀是直接利用所调节的介质的压能进行调节，不需压缩空气，使用广泛。 Self-regulating valve is directly used to regulate the pressure of the medium, do not need compressed air, widely used.
自力式调节阀是直接利用所调节的介质的压能进行调节，不需压缩空气，使用广泛。 Self-regulating valve is directly used to regulate the pressure of the medium, do not need compressed air, widely used.
参考答案和解析
AB
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