题目内容
过剩空气系数值越大,越有利于提高燃料的实际燃烧温度?
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通过实际烟气中气体成分的组成可以计算出相应的过剩空气系数。
患者，38岁。10年前曾患葡萄胎，无诱因开始阴道出血，持续2个月，量时多时少，诊刮病理报告结果为：见滋养细胞增生活跃，未见绒毛结构，最可能诊断（）
Directions:Choose the best answer from the four choices marked A, B, C and D.(本题总共25小题,每题1分,共25分)1.Sam’s three children had always been ________ to give a hand when they were not in school or doing their homework.
2.She is not particularly tall, but her slim figure gives an ________ of height.
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