问题
单项选择题
The productivity of working shifts can be improved through a decrease of（）.
A.working hours
B.gangs
C.idle time
D.weight per set
答案
参考答案：C
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The productivity of working shifts can be improved through a decrease of（）.
A.working hours
B.gangs
C.idle time
D.weight per set
参考答案：C