Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.
Giải chi tiết:
clasify = phân loại
A. ghi âm
B. chiếu sáng
C. phân loại
D. đa dạng
Population growth rates vary among regions and even among countries within the same region.
Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.