One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）
A. high TBN value
B. low oil floc point
C. low oil demulsibility
D. low oil neutralization number
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比较注重返本、领取和具有医疗保障、收费低廉等保险产品的消费人群是（）
A. 中低收入阶层
B. 高收入阶层
C. 富裕阶层
D. 富有阶层
A 200-meter vessel restricted in her ability to maneuver，at anchor，will sound a fog signal of（）.
A. a 5 second ringing of a bell forward and a 5 second sounding of a gong aft at intervals of 1 minute
B. one prolonged followed by two short blasts every 2 minutes
C. one prolonged followed by three short blasts every minute
D. one prolonged followed by three short blasts every 2 minute
推钢式板坯加热炉的进出料型式一般为端进端出式。
A. 正确
B. 错误
流体流动的阻力小，即流体通过塔设备的压力降小，以达到（）降低操作费用的要求。
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