A、<p><span style="font-family: 宋体; font-size: 13px; line-height: 19.5px; ">服务性</span></p>
B、<p><span style="font-family: 宋体; font-size: 13px; line-height: 19.5px; "><span style="line-height: 0px;"></span>专业性</span></p>
C、<p><span style="font-family: 宋体; font-size: 13px; line-height: 19.5px; ">一次性</span></p>
D、<p><span style="font-family: 宋体; font-size: 13px; line-height: 19.5px; ">持续性</span></p>