【简答题】油封常用于滚动轴承部位的密封,唇口对内封油,对外 。
【单选题】According to the passage, when small children were asked to count a pile of red and blue pencils they ______.
A.
counted the number of pencils of each color
B.
guessed at the total number of pencils
C.
counted only the pencils of their favorite color
D.
subtracted the number of red pencils from the number of blue pencils
【单选题】According to the passage, what did small children do when they were asked to count a pile of red and blue pencils?
A.
They counted the number of pencils of each color.
B.
They guessed at the total number of pencils.
C.
They counted only the pencils of their favorite color.
D.
They subtracted the number of red pencils from the number of blue pencils.
【单选题】The corporation expects only___ increases in sales next year despite a yearlong effort to revive its retailing business.
【简答题】工件以外圆柱面定位时,最常用的定位元件有 、 、 等。
【简答题】工件以外圆柱面定位时,最常用的定位元件有( )、( )、( )等,它们常用作中心定位。
【多选题】工件以外圆柱面定位时,最常用的定位元件有( )。
【判断题】单结晶体管的管脚判别,先判断发射极e,再判断基极b1和b2。
【单选题】工件以外圆柱面定位时最常用的定位元件是( )