The writer remembered that each morning Nelson would open the school with a ________ over his ________ students.
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The three letters got mailed when they on the way to Tulagi Island.
A. 对
B. 错
PVC硬片软化成型的温度范围为()
A. 100~110
B. 110~120
C. 110~130
D. 100~120
泡罩式包装机的工作过程是()
A. 成型—加料—检整—密封—压痕—冲裁
B. 检整—成型—加料—密封—压痕—冲裁
C. 加料—成型—检整—密封—压痕—冲裁
D. 压痕—成型—加料—检整—密封—冲裁
辊板式泡罩包装机的泡罩成型与热封合方式为( )
A. 吸塑成型,辊压式热封合
B. 吸塑成型,板压式热封合
C. 吹塑成型,辊压式热封合
D. 吹塑成型,板压式热封合