Sheet, of course, also may make some simple changes, such as on the top of the sheet increases some matters needing attention, the answer will not affect the normal use of sheet (figure 2).

当然答题卡也可以作些简单的修改，如在答题卡顶部增加一些答题的注意事项，也不会影响答题卡的正常使用(图2)。

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This paper introduces the advantages and working principles of GPS, elaborates the use methods and operation steps of GPS in forestry investigation, and probes into some matters needing attention.

简要介绍了GPS的优点及其工作原理，对GPS在林业调查中的使用方法及操作步骤进行了详细的描述，并探讨了其注意事项。

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The paper introduced relative knowledge of brake fluid and matters needing attention for use from following aspects: function, property, category, criterion and selection of brake fluid.

本文从制动液的作用、性能、分类、标准、使用选择等方面介绍了制动液的相关知识和使用注意事项。

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