已知f(3x)=4xlog23+233，则f(2)+f(4)+f(8)+…+f(28)的值等于（ ）。
2008
A critical corporate governance issue is ensuring that the board and its members have the requisite experienced needed to properly govern the firm for the shareholders’ benefit. When considering board member qualifications, investors and shareholders should consider whether board members can act with care and competence as a result of their experience with all of the following EXCEPT :（）
A. technologies, products, services which the firm offers.
B. the competitive landscape the firm faces.
C. strategies and planning.
为了繁殖跨步电压触电危险，在室外不要走进断电点（）米，在室内不要走进断线点（）米。
A、8、4
B、4、8
C、15、20
D、18、15
