某锅炉燃京西无烟煤,其特性如下:Cdaf=94%,Hdaf=1.4%,Odaf=3.7%,Ndaf=0.6%,Sdaf=0.3%,Aar=24%,Mar=4%。燃料特性系数β=0.024,当过量空气系数为1.1时,求实际空气量。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
一项病例对照研究数据如下,其OR值为()
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