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【单选题】
下列关于函数的说法,哪一项是错误的?()A.
函数具有重复使用性
B.
函数名的命名规则和变量命名规则相同，必须以$作为函数名的开头
C.
函数可以没有输入和输出
D.
如果把函数定义写在条件语句中，那么必须当条件表达式成立时，调用该函数
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