A.图a总净功为负，图b总净功为正，图c总净功为零 B.图a总净功为负，图b总

题库2022-08-02 4

问题

A.图a总净功为负，图b总净功为正，图c总净功为零B.图a总净功为负，图b总净功为负，图c总净功为正C.图a总净功为负，图b总净功为负，图c总净功为零D.图a总净功为正，图b总净功为正，图c总净功为负

选项 A.图a总净功为负，图b总净功为正，图c总净功为零
B.图a总净功为负，图b总净功为负，图c总净功为正
C.图a总净功为负，图b总净功为负，图c总净功为零
D.图a总净功为正，图b总净功为正，图c总净功为负

答案 C

解析

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