PSTN (public switched telephone network) consists:

Please fasten your seat belt, open the sunshade, and make sure all electronic devices have been _____ A: switched off B: open C: switched on D: closed

Xiao Fei always keeps his phone switched on.

Before the machine is switched on, ensure that no one can _________ when the machine is running.

5. They switched m________ every 10-12 miles. (--a horse that you ride on)

5. They switched m________ every 10-12 miles. (--a horse that you ride on)‌

Don’t leave you iPod in parked cars unless it is switched off.

Don’t leave your iPod in parked cars unless it is switched off.

Start-Up Diagnostics are a diagnostic routine that regularly operate automatically when the CNC is switched on.

After having switched off the mains separator, wait for ___________ before switching it back on.