Mr Liu doesn't _____________ football. [ ]
A. liking
B. likes
C. like
D. liked
答案:C
4~9岁是股骨头骨软骨病的高发年龄,原因是该时期
A.年龄小,易受外伤
B.股骨头骨骺发育不全
C.用药较多
D.骨骺血供最差
E.关节囊内压最高
热媒炉进行炉膛吹灰必须在停炉状态下进行。()