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单选题
当所要求的维护程序不是很长而且相对简单时，可以将上述的组合归入在一个标题下，称为维护实践。
A
When the required maintenance procedure is not very long and fairly simple, the above combination can be grouped under a title which is called maintenance practice.
B
When the required maintenance procedure is not lengthy and is relatively simple, a combination of the above may be grouped under one heading and called maintenance practices.
C
When the required maintenance procedures are not very long and comparatively simple, the above combinations can be bound under one subject, calling maintenance practices.
答案解析
正确答案：B
相关知识点：
维护程序分组考点速记
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