【单选题】圆弧插补段程序中,若采用半径R编程时,圆弧半径负值时( )。
【单选题】圆弧插补段程序中,若采用半径R 编程时,圆弧半径负值时( )。
【判断题】奔驰S320表示此奔驰车的排量是3.2L。
【单选题】There was only one problem in Millard and Linda Fuller's marriage.The problem was_______________ _____________________________________.
A.
they were not happy in their marriage
B.
the husband had found a mistress secretly
C.
they wanted to divorce
D.
the wife had had affair
【多选题】上课时老师将一蜂鸣器固定在教鞭一端后迅速水平旋转,蜂鸣器音调竟然忽高忽低变化,下列判断正确的是( )。
C.
蜂鸣器音调变高时,一定是向靠近观察者的方向运动
【简答题】圆弧半径R有正负之分。当圆弧圆心角()时,程序中的R用正值;当圆弧圆心角()时,R为负值。
【简答题】. 圆弧半径R有正值与负值之分。当圆弧所对的圆心角 时,R去正值;当圆弧所对的圆心角 时,R取负值。