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燃气热值是指单位数量燃气完全燃烧时所放出的热量。
燃料油燃烧产生的热量()加热炉有效热负荷。
企业要在公众心目中树立良好的形象,关键在于宣传技巧。
男性,70岁。反复咳喘25年。体检:桶状胸,双肺呼吸音减低。肺功能测定:肺活量占正常预计值70%,第一秒用力呼气量占用力肺活量50%,残气量占肺总量45%,肺总量稍降低。其肺功能损害属哪一类型?( )
长期护理保险(LTC)是为因年老、疾病或伤残而需要长期照顾的被保险人提供护理服务费用补偿的健康保险。
锥坡填土应与台背填土()进行,拱桥台背填土宜在主拱圈安装或砌筑()完成,梁式桥的轻型桥台台背填土宜在梁体安装()进行。
流行性斑疹伤寒的流行与下列哪一项因素相对较弱()
为什么根据送风温差确定了送风量之后,要根据空调精度校核换气次数?
肺充血
下列哪项是久病畏寒的主要因素( )
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