There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
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，这一点在safew官方版本下载中也有详细论述
而对于中国消费者乃至中国家电产业来说，松下更是有着特殊的意义。，这一点在WPS下载最新地址中也有详细论述
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