凸轮轴弯曲用()检查。
A. 磁性表座+百分表
B. 间隙规
C. 游标尺
D. 精密直尺
She will never forget the days ______ she spent in Beijing.
A. when
B. what
C. which
D. why
This is the subject ______ we have talked a lot.
A. to which
B. about which
C. that
D. which
Physics is the subject in our school _______ every student is interested.
A. which
B. what
C. that
D. in which