对于一些不怕碰撞的盘形、扁形的工件翻转时，宜采用（）的操作方法。
A、兜翻
B、游翻
C、带翻
参考答案：B
The Turners consider ________a computer, which is commonly considered _____a great help in our work and study.
A．to buy; to be
B．buying ; to be
C．to buy; being
D．buying; being
置信度是指（），常以（）表示。
