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【单选题】
在喷嘴挡板机构后面串联一个气动功率放大器的主要目是_____。A.
增大喷嘴挡板机构输出的压力范围
B.
用于对仪表进行调零和调量程
C.
稳定喷嘴挡板机构输出的压力
D.
增大喷嘴挡板机构输出压力信号的流量
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A.
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B.
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C.
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D.
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A.
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