A、<p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">基础</span></p><p><br></p>
B、<p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">突破口</span></p><p><br></p>
C、<p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">切入点</span></p><p><br></p>
D、<p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋体">大方向</span></p><p><br></p>