I'm going to school ________ Monday.[ ]
A. in
B. on
C. at
D. of
答案:B
刍DLS线圈通电后,动铁芯被电磁吸力吸向静铁芯并带动尾杆下移,针阀关闭(),柴油机才能启动和正常。
线粒体