A、<span style=";font-family:宋体;font-size:14px">1</span></p><p></p>
B、<span style=";font-family:宋体;font-size:14px">2</span></p><p></p>
C、<span style=";font-family:宋体;font-size:14px">10</span></p><p></p>
D、<span style=";font-family:宋体;font-size:14px">无穷多次</span></p><p></p>