截止阀的阀瓣为()。 ["A、圆锥形","B、盘形","C、圆形","D、方形"]
截止阀是()阀门。 ["A、向上闭合式","B、向下闭合式","C、升降式","D、旋启式"]
芳烃抽提的原料()是凝析油装置常压塔的()。
以下那个阀门表示截止阀()。 ["A、J41H-16DN50","B、Z41H-25DN50","C、H44H-25DN50","D、Q41F-16DN50"]
截止阀的规格J41H-25DN200中25表示的意思是()。 ["A、阀门公称直径","B、阀体总长度","C、阀门总高度","D、阀门公称压力"]
苯塔塔底温度控制在()℃,温差控制在()℃。