铜催化剂上乙烯加氢反应，表面反应为决速步骤，若铜催化剂对H2及C2H6均为弱吸附，对C2H4为强吸附，则反应速率r等于（）A. dfrac ({P)_(H)(H)_(2)}({P)_({C)_(2)(H)_(4)}} B. dfrac ({P)_(H)(H)_(2)}({P)_({C)_(2)(H)_(4)}} C. dfrac ({P)_(H)(H)_(2)}({P)_({C)_(2)(H)_(4)}} D. dfrac ({P)_(H)(H)_(2)}({P)_({C)_(2)(H)_(4)}}

铜催化剂上乙烯加氢反应，表面反应为决速步骤，若铜催化剂对H2及C2H6均为弱吸附，对C2H4为强吸附，则反应速率r等于（）

A.
B.
C.
D.