Laws on military service since 1960 still hold good.
Giải chi tiết:
Hold good = tổ chức tốt, giữ vững
A. điều kiện tốt
B. duy trì tốt
C. đứng vững
D. duy trì hiệu quả
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.