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
公司解散时,应当成立清算组;清算组应当自成立之日起十日内通知债权人,并于六十日内在报纸上至少公告三次。
A. 正确
B. 错误