亲等
参考答案：
亲属的等级，是计算亲属关系亲疏远近的基本单位。
低位肛周脓肿包括（）
A.坐骨直肠间隙脓肿
B.直肠粘膜下脓肿
C.括约肌间脓肿
D.肛管后间隙脓肿
E.直肠后间隙脓肿
The clean-up operation at the bullet train crash site in east China’s Zhejiang province has been completed. Meantime, trains have resumed services on the railway ______ the accident occurred.
A．which
B．that
C．where
D．the place where
