How do you go to school?[ ]
A. She goes to school by bus.
B. I go to school by bus.
答案:B
疼痛性跛行见于()
A.小儿麻痹后遗症
B.股骨头无菌性坏死
C.化脓性髋关节炎
D.暂时性滑膜炎
E.髋关节结核
简述直立式防波堤的优点?