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<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">解：∵</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">EC</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">EA</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">．∠</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">CAE</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">30</span></span><span style="line-height:150%"><span style="font-family:新宋体">°，</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">∴∠</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">C</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">30</span></span><span style="line-height:150%"><span style="font-family:新宋体">°，</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">∴∠</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">AED</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">30</span></span><span style="line-height:150%"><span style="font-family:新宋体">°</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">+30</span></span><span style="line-height:150%"><span style="font-family:新宋体">°＝</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">60</span></span><span style="line-height:150%"><span style="font-family:新宋体">°．</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">∵</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">AB</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">∥</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">CD</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">，</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">∴∠</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">BAF</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝∠</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">AED</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">60</span></span><span style="line-height:150%"><span style="font-family:新宋体">°．</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">故选：</span></span><i><span style="line-height:150%"><span style="font-family:"Times New Roman"">D</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">．</span></span></span></span></span>

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