document.write('<p>12.（1）B （2）绘图：如图9所示。</p><p><img src=\"http://www.alatiku.com/d/file/shiti/8fc034f50bb05a2031386ebfee4bfcc1.jpg\" alt=\"dfa92b35151ae7a42eccc799b10a832a.jpg\" width=\"431\" height=\"200\" /></p>');