free-pendulum clock (=Shortt clock)

addition coefficient selection in equipment selection

GT selection rules (=Gamow-Teller selection rules)

railway route selection；railway location；approximate railway location；location of railway route selection

Route Selection and Station Site Selection

site selection and capacity selection

variable selection and value selection

’clock’method

18 o’clock statistic of the railway station

40 GHz clock recovery

absolute clock

access of synchronous clock

active high clock

active low clock

airborne clock

alarm clock

alarm clock movement

All optical clock extraction

all optical clock recovery