Thép là hợp kim của sắt số với các bon và một tạp chất khác như Mn, Si, S, P. Trong đó lượng các bon là:
a) C < 2,14%  c) C = 2,14 ÷ 6,67% 
b) C ≥ 2,14%  d) C = 3 ÷ 4,5% 

the answer would be b i believe

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but