China's electric vehicle charging network continued its rapid expansion in January, with total charging connectors reaching 20.7 million by month-end, up 49.6% from a year earlier, according to data released by the National Energy Administration on Friday.
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:
，这一点在搜狗输入法2026中也有详细论述
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