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问题
判断题
（）分拣封发平衡合拢工作的主要内容包括填写分拣封发平衡合拢表。
答案
参考答案：
对
选择题
It's the second time that I _____ in Shanghai! What great changes have taken place in Shanghai! It is ten years since I _____ it last time.
A. have been; left
B. had been; left
C. have been; had left
D. went; had left
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问答题 简答题
根据PLC程序作用的不同，可分为哪几类？
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