直径小于（）的麻花钻，尾部是圆柱形的，借助钻夹头夹紧直柄钻头进行钻削。
A.13mm
B.15mm
C.l7mm
D.19mm
参考答案：A
— Why does Jane feel so upset?
— She failed the exam and she has no friends ____. [ ]
A. talking
B. talking with
C. to talk
D. to talk with
茜草素型
