A:CH4+Cl2 →光照 CH3Cl+HCl
B:CH2═CH2+Br2→CH2BrCH2Br
C:2CH3CH2OH+O2 →△Cu 2CH3CHO+2H2O
D: +HNO3 →50~60℃浓H2SO4 +H2O
力是一个物体对另一个物体产生了____。
Mr. Lee for Taiwan for his holidays the day after tomorrow.