I think there is something wrong _____ your watch. [ ]
A. with
B. on
C. at
D. in
答案:A
分解因式:9a2b-b= .
急性下壁心肌梗死常可合并()
A.右室心肌梗死
B.前间壁心肌梗死
C.高侧壁心肌梗死
D.后壁心肌梗死
E.前壁心肌梗死