This paper discusses the five main activities of software test and their features, pointing out the two test activities best suitable for automation: test execution and test check.
研究了测试的五个活动和它们的特点，指出了最适合于自动化的两个测试活动：测试执行和测试检查。
Check valves MUST be installed with the valves flow arrow pointing in the direction of the flow.
安装止回阀必须使其阀门流向箭头与流体流向相一致。
Check valves MUST be installed with the valves flow arrow pointing in the direction of the flow.
安装止回阀必须使其阀门流向箭头与流体流向相一致。
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