[单选题]
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
参考答案与解析：
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