题目内容

在光电传感器中，接电源正极的是（）颜色的线。

A. 黑色
B. 蓝色
C. 棕色
D. 黄色

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供料单元开始供料时，气缸的动作顺序是（）。

A. 顶料气缸推料气缸
B. 推料气缸顶料气缸
C. 放料气缸推料气缸
D. 推料气缸放料气缸

Groundnuts are packed in gunny bags,each()50 kilograms.

A. contains
B. contained
C. contain
D. containing

Chinese chestnuts are packed in gunny bags()50 kolograms each.

It was found upon examination that nearly 20% of the package had been broken,obviously attributed to improper()