Knowledge practice. [ ]
A. begins with
B. begins on
C. begins at
D. begins in
答案:A
在立式数铣中,主轴轴线方向应为()轴。
A.X
B.Y
C.Z
D.U
药用部位为子实体的药材为
A.冬虫夏草B.马勃C.猪苓D.茯苓E.雷丸