Fig. 5 shows a possible application of a four dimensional (4d) visualization of class two, from 25 to 50 kW of maximum contractual demand.

图5展示了二级中四维可视频化的一种可能性运用，最大需求功率25到50千瓦。

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Insurance companies would utilize co-pays, deductibles, coverage limitations, and other contractual features that discourage inefficient levels of care, and more generous policies would be more expensive, discouraging demand for such coverage.

CNN: Commentary: US health costs out of control