answer explanation: <u>A reference designator indicates the location to insert a component on an item, for example, where to mount an electronic component on a printed circuit board. ... Link a single reference designator to a single (E)BOM line. One or more identical items on the (E)BOM line have the same reference designator.</u>
A means the same thing as the English words under the Chinese definition
B means it usually sleeps for 15 minutes at night
C he goes to bed at 10:15 at night
D means he usually goes to be at 10:15 at night
