标准手持是指为了以相同顺序重复进行作业，工位内所需的最小限度的（）数量。
A.工具
B.工位器具
C.在制品
参考答案：C
After a long journey across the whole country from north to south, they found themselves ________ as
well as their clothes. [ ]
A．picked out
B．called out
C．caught out
D．worn out
安全色有几种？分别代表什么意思？
