单项选择题 根据以下材料，回答题He works ten hours a day, makes more thanUS $ 98000 a year, doesn′t 16 to take holidays, dresses 17 he pleases. He′s 18 been happier and is looking foranother job. This 33-year-old white, un

单项选择题 若P{X≥0, Y≥0}=3/7, P{X≥0}=4/7, P{Y≥0}=4/7, 则P{max(X, Y)≥0}=

单项选择题 关于测量血压的注意事项，下列选项正确的是（）