【单选题】【消耗次数：1】
如图表示的阀门与管道的连接画法（ ）。<img src="20200602/1591088873332512.png" title="1591088873332512.png" alt="8TT.png"/>
①
焊接
②
管托
③
法兰连接
④
螺纹连接
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