在外圆磨床上磨削工件一般用（）装夹
A.一夹一顶
B.两顶尖
C.三爪卡盘
D.电磁吸盘
参考答案：B
—Where _____ Lucy from?
—She's from America. [ ]
A. does
B. do
C. is
D. are
海关对出借本人报关员证件、借用他人报关员证件或者涂改报关员证件内容的报关员记10分。( )
