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在连接运算中，【】接是去掉重复属性的等值连接。

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开户银行拒绝接受公司交付的银行汇票是否合法？说明理由。公司是否可以向出票银行申请付款？说明理由。

按重要性对下棋的作用进行排序，并说明理由：提高智力、提高心理素质、丰富群众业余生活、培养遵规守矩的精神。

该项目当前的软件问题处理状况如下：
测试项目当前剩余处在“待验”状态的软件问题有105个，处在“新建”状态的软件问题有14个，处在“打开”状态的软件问题有151个。已知该测试组的软件问题日常处理能力是90个软件问题/工作日，开发组日常修复软件问题的能力是40个软件问题/工作日。请说明软件问题报告处理方面说明存在的问题和需要尽快开展的相关开发和测试工作。

"Being angry increases the risk of injury, especially among men," new research says.
The researchers gathered data on more than 2, 400 accident victims at three Missouri hospitals. They interviewed each subject to determine the patient's emotional state just before the injury and 24 hours earlier, gathering data on whether the patients felt irritable, angry or hostile, and to what degree. Then they compared the results with a control group of uninjured people.
(52) Despite widespread belief in "road rage," anger did not correlate with injuries from traffic accidents.
(53) Not surprisingly, anger was strongly associated with injuries inflicted deliberately. But other injuries--those neither intentionally inflicted nor from falls or traffic accidents--also showed strong associations with anger.
(54) The correlations were significantly weaker for women than for men, but there were no differences by race. The authors acknowledge that their data depend on self-reports, which are not always reliable.
(55) Why anger correlates with injury is not known. "I can speculate that the anger may have prompted some behavior. that led to the injury, or may have simply distracted the person, leading in directly to the injury," said the study's lead author.
(31)