The writer decided to write letters to show ________ to those who had helped him in his life.
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The writer’s father had impressed upon him from boyhood a love of ________ and ________.
The writer remembered that each morning Nelson would open the school with a ________ over his ________ students.
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