同理，在import的时候，最好使用“单类型导入(single-type-import)”，直接import你需要的类，而不是导入整个包，这样也能减少编译器多余的查找，节省性能。
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You can, however, only import the documents you actually need. The XML Schema Standard Type Library contains several documents with a single type
但是，您可以只导入实际需要的文档。
Compared with the same type of DC motor, single light 20 to 30%, compared with similar foreign motor, its price is only about one third of the import motor, has a broad market prospect.
与同类型直流电动机相比，单机重量轻20 ~ 30%左右，与国外同类电机相比较，其价格仅为进口电机的三分之一左右，具有广阔的市场发展前景。
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