what is a cctv?

what is meaning of WWW?

what is a usb? do you function of usb?

what is meaning of spf?

do you know what is a SIM?

what is a RADAR?do you know about radar?

do you know about NASA?

what is an ICU ward?

what is a DNA?

what is an ATM?

what is meaning of the AM & PM?

do you know what is a wifi signal meaning?

what is the R4 method?

what is meaning of the word LIFE?

how an LCD works?

do you know the role of GPS?

what is an gif in computer software?

Do you know what ECG stands for?

what is meaning of AIDS.

Do you know meaning of " PIN".

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