下列关于转炉冶炼设备设施的安全控制措施，说法正确的是（）。

• A150t以下的转炉，最大出钢量应不超过公称容量
• B200t以上的转炉，按定量法操作
• C氧气阀门站至氧枪软管接头的氧气管应采用Q345B钢管
• D氧枪软管接头前应设置长0.5m以上的铜管

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