A terrible earthquake happened in Japan _____ March, 2011. [ ]
A. to
B. on
C. in
D. at
答案:C
鼻咽癌照射不应包括()
A.耳孔
B.眼睛
C.颅底
D.颈部
E.鼻咽
当所有火花塞呈现灰白色泽时,说明空气/燃料混合太浓。