If ever there was a book that covered all the aspects of physical-layertest and measurement, this is it.
如果说有一本书可以覆盖物理层测试测量的方方面面，那么它就是《数字通信测试测量》了。
2
The test of the actual working condition of individual layer, that is, the test of water injection amount and pressure of individual layer, has been realized by means of separate layertest.
分层测试实现了实际工况各单层分测：即测分层注入量和分层压力。
3
For instance if we know that the team has test the Data Layer well, but the GUI layer has been harder to Unit Test then the testers should focus more effort on the GUI layer.