
复制
纠错
➡️如需代学继续教育,联系微信:yizhituziang
【多选题】
切削运动是由机床提供的,分为主运动和进给运动。下面哪种机床中刀具的运动是主运动:()。
【单选题】
刀具切削刃与工件的接触长度在同时垂直于主运动和进给运动的方向上的投影值称为( )
【判断题】
当刀具切断或切槽时,刀具进给运动是沿横向进行的,该说法( )
【判断题】
车床主轴的旋转运动和刀具的进给运动是采用同一台电动机来拖动的。
【单选题】
运动负荷又称为运动量,主要是由运动强度、( )决定的。
【单选题】
Sam, having forgotten to save his work [] lost all of his revisions when his computer crashed.
【单选题】
Mr Longman has played the cello for many years [] but he now conducts an orchestra.
【判断题】
The semicolon is used to separate a series of items with internal commas.
【判断题】
In English, the colon is used after the verb of saying and before a quotation.
【判断题】
A line is never begun with a comma, a period or a semicolon.
【判断题】
Words with hyphens can be divided at random.
【单选题】
It was Monday morning. [] Li Leis grandfather was ill.
【单选题】
There was only one thing to do [] study till dawn.
【单选题】
If a book is in English, [] means a slow progress for you.
【单选题】
As I turned around, I heard a loud noise [] for the bookshelf had collapsed.