Do you know where _____ some maps? [ ]
A. can I buy
B. can buy
C. I can buy
D. buy
答案:C
在298.15K时,1mol石墨完全燃烧可以放出393.5kJ的热,正确的热化学反应方程式是()。
A.C(石墨)+O2(g)=CO2(g)
B.C(石墨)+O2(g)=CO2(g)+393.5kJ
C.
D.
差压式流量计,孔板装直径比及雷诺数的变化对流出系数有何影响?由此会使计量气量与实际气量有何偏差?