A:滴加液体
B:验满氧气
C:读取液体体积
D:向试管中加固体
Afterwards, we received a letter, in which he offered an a____ for his rudeness at the party.
地球上某点以东是东半球,以西是西半球,以南是南半球,以北是北半球,则该点的经纬度是( )