Which the three are true about servlet filters？（）
A filter must implement the destroy method
B. A filter must implement the doFilter method
C. A servlet may have multiple filters associated with it
D. A servlet that is to have a filter applied to it must implement the javax.servlet.FilterChain interface
E. A filter that is part of a filter chain passes control to the next filter in the chain by invoking the filterChain forward method
For each element in the web application deployment descriptor， multiple instances of a filter may be created by the web container
依据《农村水电站安全生产标准化达标评级实施办法（暂行）》，评审机构开展现场评审工作时，评审组不少于（）人，一般不超过（）人，其中评审专家不少于3人。
A. 10；15
B. 7；10
C. 5；7
D. 5；10
Top and inner graduated borderlines of the chart are（）.
A. scales of latitude
B. scales of longitude
C. compass rose
D. source data
微信支付 
支付宝支付