在没有选择可用性条件下，差分gps定位精度完全取决于电离层的空间不相关性。

In the absence of the selective availability errors, the positioning accuracy of differential GPS is strongly dependent on the spatial decorrelation of the ionosphere.

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这些关键问题有模块格式的选择、模块的组织方式、模块间通信机制、栈空间管理、名字空间管理以及符号解析和重定位。

These key problems are the choice of module format, the organization way of module, module communication mechanism, stack space management, namespace management and symbol resolve and indirection.

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在此基础上，提出购房者选择空间顺序的选择规律、空间综合权衡的选择规律、空间定位的选择规律。

And on the base, they raise the laws of choosing space, weighing space and choosing space location.

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