《商品住宅实行住宅质量保证和住宅使用说明书制度的规定》,正常使用情况下,门窗翘裂、五金件损坏保修期为()年。
A、0.5
B、1
C、2
D、3
参考答案:B
It's known that (众所周知) Suzhou is ______ in the world for its beautiful gardens. [ ]
A. one of the most beautiful countries
B. one of the beautiful countries
C. one of the most beautiful cities
D. one of the most beautiful city
甲、乙两个物体质量之比是3:5,若甲物体的质量是15kg,则乙物体的质量是______kg,甲、乙两个物体重力之比是______.