某中外合资经营企业的董事会有9名董事，出席董事会会议的董事人数符合法定要求的是( )。
A．3名B．4名C．5名D．7名
参考答案：D
The owner of a bowling alley determined that the average weight for a bowling ball is 12 pounds with a standard deviation of 1.5 pounds. A ball denoted "heavy" should be one of the top 2 percent based on weight. Assuming the weights of bowling balls are normally distributed, at what weight (in pounds) should the "heavy" designation be used（）
A. 15.08 pounds.
B. 14.00 pounds.
C. 14.22 pounds.
下列哪个不是软件工程的层次( )。
A．过程层
B．方法层
C．应用层
D．工具层
