A、<p><span style="font-family: 宋体; font-size: 19px; ">10</span></p>
B、<p><span style="font-family: 宋体; font-size: 19px; ">15</span></p>
C、<p><span style="font-family: 宋体; font-size: 19px; ">20</span></p>
D、<p><span style="font-family: 宋体; font-size: 19px; ">30</span></p>