The first model supposes every test case has equal fault detective ability and can get the same fault coverage.
第一个模型假设每个测试用例有相同的故障检测能力，能获得相同的故障覆盖率；
To assure the precision of evaluations and predictions, a good software reliability model should have the function of describing test coverage and can reflect the fault repair process.
为了保证可靠性模型的估测精度，好的软件可靠性模型应该包括对测试覆盖的说明，并且能够反映软件的错误修复过程。
Hardware coverage and failure model are adopted to simulate hardware failures in unmanned aerial vehicles (UAVs) and a test strategy of bus-level failure injection is discussed in detail.
文中采用硬件覆盖和故障模型的方法，模拟无人机系统的硬件故障，并着重讨论了在总线上注入故障的试验策略。
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