average period造句怎么写

2、Mean time to failure is the average continuously operational period — i.e. the average period between the end of one failure and the beginning of the next.

1、estimated energy average period from spectral density distribution

3、The average class hours of periodontal theory are 26.8 ( 12 - 53 ), and the average class hours of lab training are 29.6 ( 12 - 49 ), the average period clinical training is 4 - 8 weeks.