题目内容

简述油墨在墨辊上附着和脱落的条件。

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国家机关或部门对信访事项会作出哪些处理决定?

通常外光电效应有红限频率,而内光电效应无红限频率。

A. 正确
B. 错误

中等专业学校设置的教师职务为初级讲师、中级讲师和高级讲师。

A. 正确
B. 错误

All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during () for new piston rings.

A. the running-in period
B. the running process
C. gas exchange process
D. the boiler firing

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