【单选题】
A <{p}><{font _mstmutation="1" _msthash="20537" _msttexthash="10441886"}>节流阀<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20543" _msttexthash="9978878"}>溢流阀<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20539" _msttexthash="8622861"}>减压阀<{/font}><{br/}><{/p}>
D <{p data-we-empty-p="" _msthash="396254" _msttexthash="4186"}><{span style="font-size: 1em;" _msthash="7517354" _msttexthash="9046206"}>换向阀<{/span}><{/p}>
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