正确答案: A
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题目:目前铁梨木艉轴承最好的代用材料是()。
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[单选题]现代柴油机排烟温度下降,不利于废气锅炉的余热利用,因此规定废气锅炉设计的标定工况是:废气锅炉排气进口温度t1为()℃,出口温度t2为()℃。
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[单选题]现代柴油机的余热情况有较大变化()。Ⅰ.废气的能量质量下降,可利用回收的能量减少;Ⅱ.空气冷却器冷却水带走的能量质量和数量增加
仅Ⅱ对
[单选题]During repair,lubrication lines and orifices must be ().
sealed off
[单选题]The projection on a shaft designed to change circular motion into up and down or back and fore motion is called ().
cam
[单选题]The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ()
water level is abnormally low