烧柴禾时,通常把木柴架空一些才能燃烧更旺,这是因为( )
A:可以降低着火点
B:散热的速率快
C:木柴是可燃物
D:使柴禾和空气充分接触
填上“>”、“<”或“=”.
76 × 34 ____ 34
23 ÷ 16 ____ 23 ×6
119 ÷ 43 ____ 119 .
If something is not made or caused by human beings, it's .