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更多“experiment/ɪk'sperɪm（ə）nt;ek-/…”相关的问题
第1题
A sample of D-ribose(C5H10O5) with mass 0. 727 g was weighed into a calor
A sample of D-ribose（C5H10O5) with mass 0. 727 g was weighed into a calor
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A sample of D-ribose(C5H10O5) with mass 0. 727 g was weighed into a calorimeter and then ignited in presence of excess oxygen. The temperature rose by 0.910 K when the sample was combusted. In another separated experiment in the same calorimeter the combustion of 0. 825 g of benzoic acid,for which the ΔcUΘm= 3251 kJ·mol-1,gave a temperature rise of 1.940 K. Calculate the ΔrUΘmand ΔrHΘmof D-ribose combusted.
第4题
常温下，钢、不锈钢、水和空气的导热系数分别为（）。
A.45W·m‐1·K‐1，15W·m‐1·K‐1，0.6W·m‐1·K‐1和0.026W·m‐1·K‐1
B.0.6W·m‐1·K‐1，0.026W·m‐1·K‐1，45W·m‐1·K‐1和15W·m‐1·K‐1
C.0.026W·m‐1·K‐1，0.6W·m‐1·K‐1，15W·m‐1·K‐1和45W·m‐1·K‐1
D.15W·m‐1·K‐1，45W·m‐1·K‐1，0.6W·m‐1·K‐1和0.026W·m‐1·K‐1
第7题
常温下，干砖的导热系数为0.4W/（m·K)，水的导热系数为0.6W/（m·K)，湿透了的砖的导热系数应为（)。
A.小于0.6 W/(m·K)
B.等于0.6 W/(m·K)
C.大于0.6 W/(m·K)
D.小于0.4 W/(m·K)
