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[单选题]
下列反应中表达式正确的是。
A.Na(s)+1/2Cl2(g)=NaCl(s)ΔrHmθ=ΔfHmθ(NaCl,s)
B.C(石墨)+H2(g)=1/2C2H4(g)ΔrHmθ=ΔfHmθ(C2H4,g)
C.CO(g)+1/2O2(g)=CO2(g)ΔrHmθ=ΔfHmθ(CO2,g)
D.CH3OH(g)+O2(g)=CO(g)+2H2O(g)ΔrHmθ=ΔcHmθ(CH3OH,g)
提问人:网友xiayan188
发布时间:2022-01-06
A.Na(s)+1/2Cl2(g)=NaCl(s)ΔrHmθ=ΔfHmθ(NaCl,s)
B.C(石墨)+H2(g)=1/2C2H4(g)ΔrHmθ=ΔfHmθ(C2H4,g)
C.CO(g)+1/2O2(g)=CO2(g)ΔrHmθ=ΔfHmθ(CO2,g)
D.CH3OH(g)+O2(g)=CO(g)+2H2O(g)ΔrHmθ=ΔcHmθ(CH3OH,g)
A.M = (54.60±0.50)g
B.L = (0.667±0.004)m
C.T = (17.32±0.21)s
D.R = (82.742±0.18)Ω
A.range(2,100,2)
B.range(2,101,2)
C.range(1,101,1)
D.range(1,100,2)
switch语句中表达式(expression)的值不允许用的类型是
A.byte
B.int
C.boolean
D.char
C语言中表达式a+++++++=1,词法分析后,能识别出的单词个数是_______。
A.10
B.9
C.7
D.6
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