单项选择。
— do you come to school?
— By bike. [ ]
A. How
B. Where
C. What
D. Which
答案:A
缓解阀拉杆与缓解阀的连接须使用直径()的开口销。
A.Φ6mm
B.Φ7mm
C.Φ8mm
D.Φ10mm
徐夷又称()