问题
选择题
Fur coats are good means to ______ people from frost bites in cold winter. [ ]
A. stop
B. prevent
C. protect
D. keep
答案
答案：C
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Fur coats are good means to ______ people from frost bites in cold winter. [ ]
A. stop
B. prevent
C. protect
D. keep
答案：C
2SO3（g），已知起始时c(SO2)="0.4" mol·L-1，c(O2)=1mol·L-1，经测定该反应在该温度下的平衡常数K=19，当SO2转化率为50%时，该反应将( )