题目：
以下关于密封蒸汽调节阀投用正确的是（）
A.打开调节阀前后手阀，调节阀打自动
B.打开调节阀前后手阀，慢慢调节调节阀至控制压力，打自动
C.打开调节阀前手阀，开调节阀，打开调节阀后手阀
D.打开调节阀前手阀，调节阀打自动，打开调节阀后手阀
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
以下关于密封蒸汽调节阀投用正确的是（） A.打开调节阀前后手阀，调节阀打自动 B.打
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