【单选题】【消耗次数：1】
以下有关阀门的叙述中、哪条是正确的？（ ）
①
截止阀不可用来调节流量，安装时无方向性
②
闸阀不可用来调节流量，安装时有方向性
③
.闸阀可用来调节流量，安装时无方向性
④
截止阀可用来调节流量，安装时有方向性
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